2006 SS/SC, daily driving to and from work: 26-27 mpg. When I went to New Orleans over the Thanksgiving holiday to see my dad, I got an average of 32.2 mpg for the entire trip. That was with me (160 lbs), my brother (240 lbs), and probably 50 lbs of luggage/drinks in the car.

 

Do you have an SC or regular Cobalt? I can't speak for the nonSCs but in the SC there is no difference. The stock airbox is pretty free flowing and the only real difference is the sound. Granted you can expect fuel economy to go down because you want to hear the SC more.

 

i re-calculate my dic after every fill up


i have an 07 ls, 2.2L. coupe. I get 32 avg. and 27 performance. best was 33

 

Exactly, when my car was stock I would baby it and get 28 mpg. Now with just an intake, i like to hear the sound of the sc, thus mpg around 23-24 because of heavier foot.

 

I've only had my car for about a month now...

2007 2.0 SS S/C

No mods

Mix of HWY/City driving

Avg. of 23mpg.

 

24.9mpg and average spd of 27

 

I drive about 60% city and 40% highway, and I consistently get 27 MPG, according to the DIC. If I calculate it myself, its more like 23/24 MPG. The highest I've got so far is 34 MPG going to San Antonio and back, at an avg. speed of about 75-80 mph. Good luck.

 

hmm got another tank full tonight and seen the DIC go up to 33.2, then i gave a few joyrides and it was back down to 26

 

mine never stays the same. i got a lead foot and i shift at like 3 1/2 grand. i normal see 24.7 but its been going down

 

my mpg has gone down since the weather dropped to 30 degrees :-(