we would like to think the car is capable of about 45-46 with the right tires. Some depends on the traffic, of course, some days we go up to 5-10 miles stop and go, other days we pretty much cruise to and from work. But 44 for the whole week has been pretty impressive. I was getting 2 1/2 trips in my son's 97 Monte Carlo (17 gal tank) before we started hypermiling the Cobalt, which as 13.2 tank and we are getting close to four days now. My son has done some "playing" with different speeds and the internal gauge and it shows that it peaks around 47 mph in fifth gear, at about 52 mpg, and drops nearly 1 mpg for every mph up to about 55, which if you are doing the math is still 40+ mpg at 55.
