What gas mileage average do you get on your 2010 Chevy Cobalt?

[endurancemom]

I'm thinking about getting a 2010 Chevy Cobalt. My work route is majority highway mileage (90%!) I was interested in what other consumers were reporting on the actual gas mileage they are getting out of the 2010 Chevy Cobalt model. I'm looking at a 4-door version, auto.