It's a 14 gallon tank.
How many miles can a Chevy Cobalt go on a full tank?
As the base model in the Cobalt lineup, the $15,670 LS is powered by a 155-horsepower DOHC 2.2-liter inline-4 with variable valve timing. Its fuel tank will hold 13.2 gallons of regular gas, taking you (theoretically) to a cruising range of 488 highway miles.
How big is a 2007 Chevy Cobalt gas tank?
13 gal. 286/403 mi.