All I can say is that my wife loves the mpg in her Sonic hatchback over the first gen Aveo she used to have and you should see some of the mpg numbers we're cranking out over at Cruzetalk.com with the Cruze Eco rated at 42mpg/hwy. Alot of us with our Eco packages, me included are getting well over that rating. I've clocked and averaged 46/47mpg on more than one occasion on a highway trip.