shoot...i'm barely getting 220-250 on a full tank. i do a lot of city driving.
plus all the mods are not helping it at all.

At full tank of gas, I did ~400-420 miles with 85% Freeway and 15% city driving. I just install Z-tube and replace Amsoil Ea drop in air filter last night. I will keep monitoring my MPG as I go along with my mods.

JJ

i dun know how the hell u guys are getting over 400 miles a tank even 300...wtF!! i get about 200-210 miles a tank..it is 80% city driving but still..my car is stock..at the dealership they did say ooh your car is fine its suppsoe to get anywhere between 10-15mpg..so i saif..why the *** u advertise 19mph city on the 5at.! n he says..umm 10-15mpg is completly normal.. sedans get better mileage but your car is "more agresively tuned"..umm really so why the *** do they keep up wit our coupes if they are
"tuned more aggresively"..he says umm..huh? lol so i gave up n left.

Wow... I get 300-320 to the tank.... n thats with the supercharger. I guess try to reset the ecu n see if there is a change. Did you clean your air filter recently?