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5th Gen Gas Mileage

 
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Old 08-20-2014, 03:31 PM
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5th Gen Gas Mileage

Im so confused, I just got new spark plugs a month ago, new cat back exhaust, and a new catalytic converter (old one broke) and I barely got better gas mileage, I'm at around 18mpg!! I'm tired of buying gas 2-3 times a week! I don't drive crazy fast all the time but faster than most on the road. Any suggestions will be greatly appreciated.
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Old 08-20-2014, 04:13 PM
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Re: 5th Gen Gas Mileage

Slow down.
The more rpm's your engine turns, the faster your motor uses fuel.

Either that or be happy you get 18mpg not 16 while driving (in your words) 'faster than most'. Duh!
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welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
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Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
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Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead
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Old 08-20-2014, 04:28 PM
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Re: 5th Gen Gas Mileage

Alright Supreme Member, that is painfully obvious. I definitely don't drive hard enough to get 5-7 mpg less than I should be getting, maybe I should've been more clear. I posted this cause I think something's wrong with my car, and was hoping for someone to have an idea of an action I can take to make it better.
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Old 08-20-2014, 04:50 PM
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Re: 5th Gen Gas Mileage

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Originally Posted by Doyle510 View Post
I'm so confused, I just got new spark plugs a month ago, new cat back exhaust, and a new catalytic converter (old one broke) and I barely got better gas mileage, I'm at around 18 mpg!! I'm tired of buying gas 2-3 times a week! I don't drive crazy fast all the time but faster than most on the road. Any suggestions will be greatly appreciated.
Some things you should check are

1. Tire pressure: Make sure they are still at the recommended pressure, or a even a couple PSI higher. This reduces rolling resistance and increases gas mileage.

2. Timing: Be sure that your timing is set properly for your setup. Changing CAT to a less restrictive one can alter your back pressure which changes the flow characteristics of your engine. Take note of where your timing currently is and then adjust your timing to where you get the highest idle speed. This is USUALLY your optimum setting.

3. Fuel: When you set your timing, always use the same octane gas as what you set it with. (I even try to use the same Brand and even same Gas Station to avoid any variables) This can affect your performance, which would also effect your economy.

4. Slip-Stream: Keep your car washed and waxed as this will decrease aerodynamic drag.

5. O2 Sensors: Did you change these when you did the CAT-Back system? Even though they aren't throwing codes, (CEL/MIL Light) they could be "just good enough" to not cause the ECU to trip, but "just bad enough" to cause a rich fuel condition, essentially causing your car to use more fuel than usual.

Try these things and let us know if it improves. If you do them one at a time, you can pinpoint which one improves it so you know exactly what to do the NEXT time your economy starts slipping...
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Old 08-20-2014, 05:24 PM
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Re: 5th Gen Gas Mileage

i did a whole write up on this topic...... a search would do you some good....

oh btw, because you arent the type of person who likes to search to find the info for his own problems, the link is in my signature. still cant find it, then try a search
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Old 08-20-2014, 05:59 PM
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Re: 5th Gen Gas Mileage

Seriously Doyle...driving 60 vs 70 will get you 5-8 more mpg.

I just came back from a trip where when I drove 55 in my van I got 32 mpg, at 65 I got 26 and at 70 I got 22 mpg.

Do you let your car warm up before you take off? Say 3-4 minutes..?...Driving these old engines warmed up also increases mpg the first 10 minutes or so.
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welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
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Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead

Last edited by bykfixer; 08-20-2014 at 06:01 PM.
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Old 08-20-2014, 06:02 PM
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Re: 5th Gen Gas Mileage

Thanks Tone, I'm gonna check tire pressure today. It's nice to get a least one serious answer and not just another sassy reply lmao
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Old 08-20-2014, 07:16 PM
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Re: 5th Gen Gas Mileage

Hey, I tried. But...


By the way Doyle you are like the 1264th person this year to enquire how come you can't drive as fast as everybody else (you say faster) and get stellar gas mileage. I've probably answered this question similar to the meister at least 100 times...no telling how many others here have also done the same.

Finally...a little fyi.
The faster a motor's combustion chamber produces combustion the faster it uses fuel.
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Quote:
Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead

Last edited by bykfixer; 08-20-2014 at 07:21 PM.
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Old 08-20-2014, 08:10 PM
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Re: 5th Gen Gas Mileage

My best advice on the subject: Slow down and keep all the pressure in your tires in check. If you take short journeys, you're going to worse mileage than you do on longer, more open road journeys. In my car, I'm currently only getting 17,18, 19 at best. Last semester when I was doing a 60 mile round-trip drive back and forth to my internship for college, I was getting 22-24. I also get much better mileage in mine when I slow down even 5-10 mph. I'm not saying you have to drive like a granny, but don't be speed racer off the line from every stop light. I guarantee you it will help.
Another thing my friend....If you're going to last on forums, you need to learn 2 things. #1: Search before you post. This forum has been here awhile, as have other Prelude forums. In that time, there have been more question threads about various topics than you can imagine. Chances are many of your questions have already been asked(Forum dwelling 101). It's the biggest advantage forums have over Facebook, so use it to the fullest! #2, Learn to take advice. You're going to get quite a bit of it around here. It is a valuable asset that will help you garnish a wealth of knowledge about the car you are driving. Now, Some of it will be expert, some will be questionable, and others will be somewhere in the middle of the two. You just have to figure out which is which based on what's said and who's saying it(and how many are saying it.)


Oh, and Welcome to Preludezone, by the way.
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Old 08-20-2014, 08:21 PM
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Re: 5th Gen Gas Mileage

Quote:
Originally Posted by westernprelude View Post
My best advice on the subject: Slow down and keep all the pressure in your tires in check. If you take short journeys, you're going to worse mileage than you do on longer, more open road journeys. In my car, I'm currently only getting 17,18, 19 at best. Last semester when I was doing a 60 mile round-trip drive back and forth to my internship for college, I was getting 22-24. I also get much better mileage in mine when I slow down even 5-10 mph. I'm not saying you have to drive like a granny, but don't be speed racer off the line from every stop light. I guarantee you it will help.
Another thing my friend....If you're going to last on forums, you need to learn 2 things. #1: Search before you post. This forum has been here awhile, as have other Prelude forums. In that time, there have been more question threads about various topics than you can imagine. Chances are many of your questions have already been asked(Forum dwelling 101). It's the biggest advantage forums have over Facebook, so use it to the fullest! #2, Learn to take advice. You're going to get quite a bit of it around here. It is a valuable asset that will help you garnish a wealth of knowledge about the car you are driving. Now, Some of it will be expert, some will be questionable, and others will be somewhere in the middle of the two. You just have to figure out which is which based on what's said and who's saying it(and how many are saying it.)


Oh, and Welcome to Preludezone, by the way.
+1. Well put.
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Quote:
Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead
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Old 08-21-2014, 09:12 AM
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Re: 5th Gen Gas Mileage

These cars are old now. Not going to get anywhere near the expected MPG unless you've kept up with your maintenance, and even so, those are just estimates on ideal driving conditions.

Driving faster than most will get you lower MPG and most.

I don't drive like a dick in my 93 VTEC and get about 25 MPG mixed driving.

Oh yea, are you using premium gas?
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Old 08-21-2014, 01:33 PM
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Re: 5th Gen Gas Mileage

5th gear rpm is so high at 60. Slow down.

I'm the hurried/rushed type of person and always doing 70. I was at 18 mpg and was thinking this car have a problem.

Someone told me "3000 rpm is the secret". I was like no way i'll drive granny style in the right lane.

But I gave it a try at 60 max all the time. Even 55.

It was tough at first.

But when I realised I got from 18 mpg to 24 mpg...
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Old 08-21-2014, 04:39 PM
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Re: 5th Gen Gas Mileage

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Originally Posted by bykfixer View Post
...I've probably answered this question similar to the meister at least 100 times...
Yeah, I even asked this question not that long ago, I think that some of what I put actually was suggested by bykfixer himself!
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Old 08-21-2014, 06:22 PM
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Re: 5th Gen Gas Mileage

I get about 18 mpg. It's so difficult to drive at 60 or even 65 mph, my car just runs better I think at 70 which is wat I'm doing most of the time. Also I heard premium burns faster then regular so that might contribute to the kinda low gas milage. 18 to 20 is ok I would believe for a car that is 15 years old in my case with my 99 sh.
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Old 08-21-2014, 08:37 PM
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Re: 5th Gen Gas Mileage

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Originally Posted by tonemeister69 View Post
Yeah, I even asked this question not that long ago, I think that some of what I put actually was suggested by bykfixer himself!
I'm blushing.

Nah, seriously, I see you around a lot lately trying to lend a hand as well. Mucho appreciated. It's what differs pz from the others. Thanks for doing your part in that tonemeister.
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Quote:
Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead

Last edited by bykfixer; 08-21-2014 at 08:40 PM.
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Old 08-22-2014, 09:44 AM
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Re: 5th Gen Gas Mileage

Quote:
Originally Posted by 5ThGeaRedLined View Post
...Also I heard premium burns faster then regular so that might contribute to the kinda low gas mileage...
ACTUALLY... Regular lower Octane gas burns faster than premium. High octane gas has additives that increase the ignition temperature to account for the higher compression engines.

Quote:
Originally Posted by bykfixer View Post
I'm blushing.

Nah, seriously, I see you around a lot lately trying to lend a hand as well. Mucho appreciated. It's what differs pz from the others. Thanks for doing your part in that tonemeister.
I am happy to help and especially share what I learn from you guys and through my own findings as I fix ALL the little quirks of my Prelude. I am hoping to be able to add some DIY's for the 3rd GEN's that also may apply to some of the other GEN's as well.
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Old 08-22-2014, 11:54 AM
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Re: 5th Gen Gas Mileage

I'll add my experiences with mileage... I have a stock 97 sh.
So the best mileage I regularly get is 28mpg. I drive around 370 miles before my light comes on and I stop to get gas, it takes 12-13 gallons to fill it up at this point (I use 91 octance premium). My driving habits include shifting at or before 3k rpm while the engine is cold. Once the engine temp indicator stabilizes at its regular place, I then start shifting between 3-4k rpm (shifting in between these two points has netted me the best mileage). My regular round trip to work drive is 30 miles on the highway at 75-80mph (around 4k rpm), then a short stint in the city of about 10 miles of stop and go, usually not going faster than 45. I don't accelerate real hard, just enough to keep up with traffic.

The thing (in my experience at least) that really eats away your mileage is the stop and go. RPMs don't seem to have an affect as great as the stop and go driving does, as I sometimes will speed up to 85 or 90 on the highway if traffic is moving along nicely (closer to 5k rpms) and my mileage difference is hardly if at all noticeable. Now if I spend a lot of my week driving around in town, thats when I go from getting 370 miles before the light comes on to closer to 250-300 miles.

Just to help with what I'm saying: On a 3000 mile road trip made up of 99% highway miles I regularly got around 400 miles to a tank. The point I'm trying to make here, if you don't have to stop very much you will save a lot of gas.
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Old 08-22-2014, 01:28 PM
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Re: 5th Gen Gas Mileage

... Wasn't there a "gas thread" ban going on around these parts?

Not my point, but in all honesty... You're driving a sports coupe. It's gonna burn fuel. The more stupid the grin you're wearing while driving your prelude, the sadder your wallet is going to be.

I have that grin all week long and only get 8.7mpg average... When I could be a miser and get 20+ in my toy. It's not worth being a miser. Enjoy your sh!t
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Old 08-22-2014, 01:54 PM
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Re: 5th Gen Gas Mileage

Quote:
Originally Posted by Sideswipe SI View Post
... Wasn't there a "gas thread" ban going on around these parts?

Not my point, but in all honesty... You're driving a sports coupe. It's gonna burn fuel. The more stupid the grin you're wearing while driving your prelude, the sadder your wallet is going to be.

I have that grin all week long and only get 8.7mpg average... When I could be a miser and get 20+ in my toy. It's not worth being a miser. Enjoy your sh!t
Sorry for adding fuel to the fire... Pun intended!
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Old 08-22-2014, 02:54 PM
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Re: 5th Gen Gas Mileage

Ah, that Sideswipe fertile mind!

My old cutlass had a floating gas gauge that when you were down to say a half tank, had a ton of movement in the needle based on driving conditions. It went up, it went down. It went down then back up....that is unless you smashed the accelerator pedal. If you drove it like a sports car you could actually see the needle dropping. It used 98 octane and took 23 gallons to fill it. I was thrilled to get 150 miles in a tank full.
Thing is, my Prelude handles way better and does the 0-60 thing just about as fast as that 4 bolt 350 with lots of goodies inside. 18mpg is heaven on earth imo in a car as quick and nimble as a 97 Honda Prelude.

Want 30 mpg? Get a Fit.
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Quote:
Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead

Last edited by bykfixer; 08-22-2014 at 02:59 PM.
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Old 08-22-2014, 03:55 PM
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Re: 5th Gen Gas Mileage

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Originally Posted by bykfixer View Post
Ah, that Sideswipe fertile mind!

My old cutlass had a floating gas gauge that when you were down to say a half tank, had a ton of movement in the needle based on driving conditions. It went up, it went down. It went down then back up....that is unless you smashed the accelerator pedal. If you drove it like a sports car you could actually see the needle dropping. It used 98 octane and took 23 gallons to fill it. I was thrilled to get 150 miles in a tank full.
Thing is, my Prelude handles way better and does the 0-60 thing just about as fast as that 4 bolt 350 with lots of goodies inside. 18mpg is heaven on earth imo in a car as quick and nimble as a 97 Honda Prelude.

Want 30 mpg? Get a Fit.
^^x10 I feel you on that one!

I know what you mean about the Muscle Car... I had a 78 Skylark with a HP 350 that only got 12 MPG whether I did all the econo-tricks or not... And it took 93 Octane minimum. Now, my Prelude isn't as quick as it was off the line but it is definitely more nimble than it was...
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Old 08-22-2014, 11:48 PM
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Re: 5th Gen Gas Mileage

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Originally Posted by Azwethinkweiz View Post
I'll add my experiences with mileage... I have a stock 97 sh.
So the best mileage I regularly get is 28mpg. I drive around 370 miles before my light comes on and I stop to get gas, it takes 12-13 gallons to fill it up at this point (I use 91 octance premium). My driving habits include shifting at or before 3k rpm while the engine is cold. Once the engine temp indicator stabilizes at its regular place, I then start shifting between 3-4k rpm (shifting in between these two points has netted me the best mileage). My regular round trip to work drive is 30 miles on the highway at 75-80mph (around 4k rpm), then a short stint in the city of about 10 miles of stop and go, usually not going faster than 45. I don't accelerate real hard, just enough to keep up with traffic.

The thing (in my experience at least) that really eats away your mileage is the stop and go. RPMs don't seem to have an affect as great as the stop and go driving does, as I sometimes will speed up to 85 or 90 on the highway if traffic is moving along nicely (closer to 5k rpms) and my mileage difference is hardly if at all noticeable. Now if I spend a lot of my week driving around in town, thats when I go from getting 370 miles before the light comes on to closer to 250-300 miles.

Just to help with what I'm saying: On a 3000 mile road trip made up of 99% highway miles I regularly got around 400 miles to a tank. The point I'm trying to make here, if you don't have to stop very much you will save a lot of gas.
Couldn't agree with you more, Stop and Go (City Driving) kills my mileage.
I've got an Auto Lude, when driving in the city, I'll get 20mpg. Majority of my driving is all city.

When driving on the highway, I'll easily get 30mpg. On the highway I usually drive just under 70mph revving just under 3000rpm.
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