rmay635703:
Look at this.
Fuel Economy of the 2005 Chevrolet Cobalt
21 city / 29 highway
She isnt too far off the mark of what the manufacturer rating is. Hers is a 2005 base with an automatic.
Fuel Economy of the 2010 Chevrolet Cobalt Sedan
2010 Cobalt base automatic
24 city /33 highway
Unless you are driving all highway with areomods and efficiency mods then I cant see your car doing too much better than hers is.