you might be right storm. But still dont think this can be true whether there is over drive or not.
Its just that GM is going downhill nowadays and they just want to fool customers with their low mileage gimmick.
Oh come buy our cars, they dont drink gasoline anymore, they are fasting.
These figures cant be true.
I am searching for some reviews of this car on web, let me see if i can find something which indicates its true mileage. May be topgear website will have some data on this. wait let me see if i can find something.