"Have you driven a Ford, lately?" As a charity stunt, Ford had specially trained drivers drive an unmodified stock 2010 Ford Fusion (mid-size sedan) to beat 1,000 miles in a single tank of gas. They reached 1,445.7 miles in 69 hours of driving around the D.C. area on surface streets and highways. "Your mileage may vary." Ford readily admits that this was a stunt, and the details of how it was done are available in many places, like here. Oh, and details about why are here. The car is normally expected to get about 40 miles per gallon under everyday conditions.