i just got my GP and love it but want to do some mods but don't want to the mpg's if anything i want to get better if at all possible. i have an 2004 GT2 thanks!

Drive slower, keep the RPMs under 2500. No money required for those mods.

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2004 Impala SS - ZZP PCM, 3.4" Pulley, K&N CAI, TOG Headers, SLP Cat-Back, 180* thermo, Autolite 605s, PRJ Performance wires, Alternator rewire, GMPP Handling kit
2000 Grand Prix GT, Commuter Car - K&N CAI, GMPP Handling kit, ZZP downpipe w/U-bend delete, ZZP Plog, Alternator rewire

HPTuner. I get around 28 in the city and around 31 on the highway with the mods in my sig.The highway mpg could be better but im running 3.29 gears wich brings my cruise rpms up a little in fourth when on the highway.

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1999 Silver GTP~HP Tuners~XP cam~ZZP FS Intercooler~ZZP 78mm Billet Throttlebody~LQ4 MAF~Lucas 42.5's~Coated Pacesetters~2.8 MPS~PRJ fuel logs~Ported & Polished S/C~JMB fwi ~Built Tranny-3.29's-7/8's chain-Intense forged Input Shaft~

Running mid-high 12's

good advice

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1999 Silver GTP~HP Tuners~XP cam~ZZP FS Intercooler~ZZP 78mm Billet Throttlebody~LQ4 MAF~Lucas 42.5's~Coated Pacesetters~2.8 MPS~PRJ fuel logs~Ported & Polished S/C~JMB fwi ~Built Tranny-3.29's-7/8's chain-Intense forged Input Shaft~

Running mid-high 12's

Not saying you aren't getting improvements, but compared to the amount of money you paid for them, it'll be more than 5 years, if that early, before you'll get savings. Anyone making mods shouldn't be doing them to save gas. I didn't make any of my mods to save money - they were performance mods. If I get a MPG increase, it's a bonus.

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2004 Impala SS - ZZP PCM, 3.4" Pulley, K&N CAI, TOG Headers, SLP Cat-Back, 180* thermo, Autolite 605s, PRJ Performance wires, Alternator rewire, GMPP Handling kit
2000 Grand Prix GT, Commuter Car - K&N CAI, GMPP Handling kit, ZZP downpipe w/U-bend delete, ZZP Plog, Alternator rewire

You know your absolutly right. would not be a good gas saving mod if you DID not mod you car to the extent where you would need a tuner. But in performance mods a tuner would be the first thing i would suggest. the reason i said this is because there are not many people that dont get carried away with modding lol...always want something faster.So i guess i was assuming that he was going to eventually mod his car. wich may not be correct. but...if he was and he wanted to get good mpg then i would suggest a tuner to be the first mod.While the mpg that i am getting now may not be excellent...i consider it excellent for running mid to high 12's

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1999 Silver GTP~HP Tuners~XP cam~ZZP FS Intercooler~ZZP 78mm Billet Throttlebody~LQ4 MAF~Lucas 42.5's~Coated Pacesetters~2.8 MPS~PRJ fuel logs~Ported & Polished S/C~JMB fwi ~Built Tranny-3.29's-7/8's chain-Intense forged Input Shaft~

Running mid-high 12's

Fair enough. With gas prices above $4 now, anyone coming on here looking to mod their car for MPGs is barking up the wrong tree. I've even had a friend try just driving the speed limit and sticking with low accelerations. He was surprised how much a difference just doing that can make. I think people are looking for a quick fix. And hate me for saying it, but cars come from the factory are pretty well configured for fuel efficiency with a factory set up IF you drive slow and don't accelerate hard. That's why the government adjusted all the fuel economy ratings a few years ago - they were based on 55 MPH speeds and slow accelerations.

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2004 Impala SS - ZZP PCM, 3.4" Pulley, K&N CAI, TOG Headers, SLP Cat-Back, 180* thermo, Autolite 605s, PRJ Performance wires, Alternator rewire, GMPP Handling kit
2000 Grand Prix GT, Commuter Car - K&N CAI, GMPP Handling kit, ZZP downpipe w/U-bend delete, ZZP Plog, Alternator rewire

yep

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1999 Silver GTP~HP Tuners~XP cam~ZZP FS Intercooler~ZZP 78mm Billet Throttlebody~LQ4 MAF~Lucas 42.5's~Coated Pacesetters~2.8 MPS~PRJ fuel logs~Ported & Polished S/C~JMB fwi ~Built Tranny-3.29's-7/8's chain-Intense forged Input Shaft~

Running mid-high 12's

Flame me if you must but Im going to disagree with you here. Modifications for fuel economy is not barking up the wrong tree. There are things you can do for fuel economy. Power and fuel economy are not mutually exclusive nor inversely proportional.

Cars come from the factory hardly tuned well. When I bought my GP it just did get 28 mpg all highway and it was in excellent shape. Before the transmission had went out I would touching on 34 but consistently ran 32 - 33 all highway. But they are hardly set up for fuel economy from the factory, indeed, more so for emissions than anything.

My Isuzu Rodeo when I bought it barely and I mean barely got 17mpg. It is now consistently running 22 - 23 mpg combined driving. I havent yet taken it on a long run to see what it could do on an all highway drive, but my guess is that it will be at least a couple mpg's higher on an all highway run.

My plan is to fully demonstrate that there is much more mileage to be had out of the GP once I get it all back together. We dont really come even close to utilizing all of the energy of the fuel that is put into the motor. True, we will never use 100% of it due to frictional losses, but until we start using a lot more of it there will always be room for more power AND fuel economy. The two would go hand in hand because if you extract more energy from the same amout of fuel, both fuel economy and power go up.

It is true driving style has a large effect on fuel economy but it is hardly the whole picture.

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Scotty Hall
Bartlesville, OK
2001 Pontiac Grand Prix GTP
It whines a lot, but I like it.

Even if you shoot for the moon and miss, you still land among the stars.

I can get much of the improvements in MPG by changing driving style. What I'm saying, AGAIN, is if you want a car that gets good gas mileage, don't buy a car that STARTs in the 20s for MPG. People who buy Hybrids don't do the math to realized that buying a used car for $4000-$5000 is MUCH more fuel efficient than dropping $25000-$30000 on a Hybrid that gvies them a 10-15 MPG improvement. Don't make mods to you car and expect dramatic MPG improvements. I made my mods strictly for performance; any MPG increase is just a bonus. Spending $2000-$3000 up front for jsut 2-3 MPG improvement is silly. If you buy a used GP because you want a fuel efficient car, you bought the wrong car.

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2004 Impala SS - ZZP PCM, 3.4" Pulley, K&N CAI, TOG Headers, SLP Cat-Back, 180* thermo, Autolite 605s, PRJ Performance wires, Alternator rewire, GMPP Handling kit
2000 Grand Prix GT, Commuter Car - K&N CAI, GMPP Handling kit, ZZP downpipe w/U-bend delete, ZZP Plog, Alternator rewire