my little 4 banger Audi gets good mileage. i fill it up probably once every two weeks. i dont drive it very far, only about 5 miles or less a day. theres enough stuff thats within bike riding range which saves a lot of time cause theres never parking around here anymore.
if i drive my Nova, i get a healthy 5-6 miles per gallon LOL i put a 15 gal fuel cell in the back. when i fill that up and go for a drive, i usually need to refuel on my way home. but its worth it