I just got home from driving from Lafayette, LA to Hoover(Birmingham), AL. My 2008 Malibu 4-cylinder/4-spd auto got 32.6 MPG and that was with the cruise control set at 76MPH almost the whole way, it was a 440 mile trip. The car had me my wife, our 2 dogs and trunk full of stuff too. I ran 93 octane in it the whole trip and I have put a K&N airfilter in it, not sure it that helped any. Just wanted to share, thought that was awesome.