Fuel Mileage

**Scheer** · 10-21-2008

I've got an 04 GTP with no mods besides the fact it is a Comp G, which I don't think that has anything different execpt for the wheels and tap shift?

Anyways I'm getting about 23 mpg down interstate doing 80 mph, and 24-25 mpg down highway doing from 60-65 mph.

If you could, please let me know what you are getting, and with what mods.

I've always been told there is no way to gain horsepower without loosing fuel mileage, but K&N always advertises gains in HP and MPG...

Also if there are any other mods that may help, I've heard about reprogrammed PCMs helping a bit.

Thanks

**Sabrewings** · 10-21-2008

I can get 32-33MPG at 75-80MPH. I've got more MPG for my mods and HP.

**Scheer** · 10-21-2008

What kind of mods do you have?

And I think mine supposed to be getting around 28 or so on highway, no clue why I get such bad mileage.

I also was talking to my friend and he has ram air intake and borla catless exaust and was getting about 31 mpg, then put aftermarket 19" wheels and it dropped him all the way back to 25 mpg. Thats on a regular 3800 tho

**DanGTP** · 10-22-2008

Before I put my cam in, I was able to get 30-32 MPG with an average speed of 80 MPH on a hilly interstate. Now, I'm getting about 26-28 MPG with the cam on the same interstate.

**jacobmh27** · 10-22-2008

mine sucks too 24 highway

**Scheer** · 10-22-2008

I don't understand why I'm getting such bad mileage tho, its only got 35k miles, gets regular oil changes and is taken care of... I just replaced rotors, and checked the bearings and everythign was fine, theres nothing wrong with it that I know of.

**carl06GT** · 10-27-2008

Scheer how many miles do you get out of a tank?

**Bio248** · 10-27-2008

i will drive straight highway for a tank and get 22 mpg. you guys got it good. although, im not tuned in the least.

**justwhisen** · 10-27-2008

^no kidding! I get the same low 20's. it kills me to think that these same cars with good mods gets 30 and can walk alllll over me. +- logic tells you its not suposed to happed that way.

**Bogers99GTP** · 10-28-2008

Im getting around 22/24 in the city and 32/33 on the highway @ 70 mph according to the DIC.

**Scheer** · 10-29-2008

Boger, what do you have for mods tho? And I'll get around 325 to 350 miles per tank

**gtpinsc** · 10-29-2008

wow im shocked at the some of the mileage u are getting.i get on average 32-36 mpg hwy and 21-23 in town according to DIC...in the summer time it goes down a little bit.the highest i have ever had was 39 mpg, straight rd doing 55mph and outside temperature around 40 degrees...mods in signature

**beastin1** · 10-29-2008

Originally Posted by Scheer

What kind of mods do you have?

And I think mine supposed to be getting around 28 or so on highway, no clue why I get such bad mileage.

I also was talking to my friend and he has ram air intake and borla catless exaust and was getting about 31 mpg, then put aftermarket 19" wheels and it dropped him all the way back to 25 mpg. Thats on a regular 3800 tho

remember the computer doesn't know the tire size has changed...increased mass= less revolutions= the computer no longer being accurate..

mine was getting 23 or so, switched to a CAI and am now getting around 18, increased HP has it's drawbacks

**Bogers99GTP** · 10-29-2008

Originally Posted by Scheer

Boger, what do you have for mods tho? And I'll get around 325 to 350 miles per tank

I have a FWI, Plog, 180* stat, 2.5 in. DP and Autolite 104's.

**Bogers99GTP** · 10-29-2008

Originally Posted by gtpinsc

wow im shocked at the some of the mileage u are getting.i get on average 32-36 mpg hwy and 21-23 in town according to DIC...in the summer time it goes down a little bit.the highest i have ever had was 39 mpg, straight rd doing 55mph and outside temperature around 40 degrees...mods in signature

39? wow thats awesome! My best was 35mpg @ 65mph / 55-60 degree temps and downhill lol.

**gtpinsc** · 10-29-2008

Originally Posted by Boger's99GTP

39? wow thats awesome! My best was 35mpg @ 65mph / 55-60 degree temps and downhill lol.

keep in mind that was one time thing according to DIC... theres gotta be a margin of error in there somewhere i would think.

**Bogers99GTP** · 10-29-2008

Originally Posted by gtpinsc

keep in mind that was one time thing according to DIC... theres gotta be a margin of error in there somewhere i would think.

Yep...d@mn electronics lol.

**crzystve42** · 11-05-2011

I have an 05 gtp with a cold air intake and axleback exaust doing 16.7 city.

is wrong with mine? youre all pretty damn lucky lol

**Kevs98gtp** · 11-28-2011

I have 87k miles on a 98 gtp, Just a cold air intake for mods. Ave 18.3 mpg on the computer before CAI, mix of in town and highway driving. Now I'm down to 16.2. But cant stop giving it the gas to hear that whine.