Get an Aeroforce, tells you instant. It is cool how just the slightest bit in road, level change, wind will throw it off. I can get 27-30 on the highway. I just did a calculation and both city and highway I got 22.56 out of the tank, that was 365/16.XX gallons I refilled at.

Nothing better than modding (and tuning) and getting way better performance as well as increaded gas mileage!! Modding FTW!! WOOT!

CAI, HVTB, Hi flow cat, no U bend, better plugs and wires...89 fuel...I think all are contributing factors to the mileage...plus if I set the cruise on 65 I have gotten 30mpg before, which I find astounding,especially given the GT's lower gearing.

When I moved from Maine to Georgia.

Thats great stuff...I tell ya the automakers should do a little learning from their own work. The low pressure boost and taller gearing of the GTP make for a winning combo of power and efficency. Volvos have used low pressure turbos for quite a few years now with good success. I'm still amazed at how many new cars there are out there with 4cyls that still cant do 30mpg. (My Mom's PT Cruiser struggles to get 30 if at all)

i really need to start checking some stuff ... and figure out y i dont get the good mpg like everyone else lol

Most of these numbers are highway. I don't think you are using the highway that much, correct me if I am wrong.

true ... myn is about 75h 25c

That's exactly one of the reasons I love my GP so much. Getting 23 mpg on my drive to work looks better and better as gas continues to go up.

It would take me 5 gallons of gas to go to/from work in the Malibu, and about 4 gallons in the pickup.

And less than 2 gallons in the GP.

im gettin aroun 23-24 highway at 60MPH wit the cruise set. i usually fill-up every 10 days, when the pin hits around 1/8 tank. It's been costing me around 42-45 bucks to fill up i'd say, not bad for the GTP

before i changed my plugs i was getting 14 city and 22 hw, now i got new plugs and im getting 25 hw and 17 city....yeah!!!! it may get better than that since i am going to get a new o2 sensor wich i am in need of badley

I get the same with my GTP but it goes to 25MPG on the highway

I drive a lot of city miles, 3rd gear stuff, and the pedal has become my best friend.

But I don't get any less than 20 mpg. I don't understand how it manages that, but I'm not complaining. GTP ftw?

Anybody put a homemade CAI and lose their gas milage? I lost 2 miles with mine. I have a 3" pipe now and filter, I am going with a 4" pipe and the K&N 4" X 9" to see if there is a difference.

I pull in an average of 22-24mpg with mixed driving. I still need to do some tuning though.

wow. im getting an average of 16-16.5. id say 60% city 40% highway. on long highway runs i was gettin 20-21. that might be because of the 125k catalytic converter thats rattling like crazy though. o well, it was the perfect excuse for my 2.5" downpipe, high flow cat, and u-bend delete. well see what the difference is when i put it on.