howarmat

Typically if you drive correctly and dont get on in all the time or drive all city miles then it will be pretty good 22+ on the highway for me....but I do most all city driving and drive the **** out of my car so 16 is typical for a tank that doesnt see any highway really.

kenthicken

I'm all city, all the time. I was averaging 15 MPG with the stock box and tune prior to the CAI; after the CAI (running a 91 tune), I'm averaging about 16. It's pretty much a wash, but you have to factor in the "fun factor."

06tyrfryr

my wifes gt gets better mpg and mine gets a lot worse. of couse most of my driving is at the dragstrip so i can stay out of trouble because it is so fun to play with

VWILLO

21 @ 80 hyw, 17-18 town with 87or 91, with 91, 1-2 mpg better on hwy. I think I drive too fast to get great milage. With 91, I definately waste more gas having fun.

btorlv

I have a gms caiwitout a tune. I picked up 2mpg i drive 28 miles to work each way at 70mph only 3 blocks city the rest is 70 with the cruise.

2cokeman

Gas mileage goes down because you are always givin er now!!

DINOmobile

I bought the JLT CAI w/ tunes from Brenspeed. With the 87 tune I noticed my MPG went from 15 to 13.5 (around a 10% loss). I spoke with Brent at Brenspeed and he sent me out a modified 87 tune. The MPG went back up to around 14.6 or so. I haven't compared the 93 tune yet.

olvanish

Did not make a big difference for me in the city but on highway at 70mph it used to give me 25, now it went up to 30.5. that's a big f#^&*( difference.