Quote Originally Posted by hammsaveo
Have you been able to top the 32.7 yet? My first tank when I got mine in 07 with 11k on it I got 37.1. You should do well with it.
i had 28 miles on the car, im sure its just cause it was breaking in the motor. im pretty sure on my next fill up it will be much higher. im expecting to get over 400 miles.
Quote Originally Posted by serega12
59+ mpg in a boosted cobalt??? explain.
well when the car was stock i was hitting 31-33mpg. with all of the aftermarket parts, i barely have to push the motor to get up to speed. also im running a very economical tune. im only running it at around 230hp, i can change the timing and get up to 270hp. i also live right next to an express way and my job is right off an express way.

anytime your dealing with a s/c a car gets better fuel economy when its not boosting because its aiding a motor. so with a economy tune on a s/c not boosting it, and express way i get much better fuel economy then the aveo.