Before I installed AEM CAI on my car I got 330 to the tank. After installation it went down to 275. And no I don't punch it everytime to hear the growl.

Which mods on your tegs have caused gas loss and by how much?

 

turbo kit took down gas mileage a lot.

 

its different to every car but then i never heard of CAI doing that much to MPG
but then hardly anyone ever compares MPG on mods

 

for bolt ons like intake, header, and exhaust, i doubt that it affects mileage noticeably, if at all. usually most people start to drive more aggressively often, resulting in poorer mileage...but not because of the bolt ons.

 

What did it for me was the new cat. It's really free-flowing now, and thus quite e bit more rev-happy than what I'm used to.

The SRI for me decreased city milage and increased freeway mileage. My best run with the intake/headers/exhaust on the freeway was 37MPG (70 MPH, cold as hell night, and 280 traffic-free miles)

 

37 mpg????

 

my last gs-r got 33 once. and that was at 95-105 mph, with a few jaunts to 135-140. and it was 90 degrees out.

 

the best i had was from oakland to reno....about 340 on the tank. a good 15% of the drive was uphill.