Yea there are a lot of bogus entries, doesn't take long before you come across one. Check this one out, this guy gets either 700 or 800 miles EXACTLY on nearly every tank, and gets EXACTLY the same amount of fuel in each time....Honda Insight (Space ship) (Honda Insight) | Fuelly
Perhaps, but she definitely said gallons, as my ecohead kicked in to work out how far I could go with that much fuel ha! I saw a Program about the diesel engine the other day, interesting to see a freight ship can do 55,000 miles on a "full tank"
I remember reading about some Japanese car company putting solar panels on one of their small ship transports. Seeing how the really large transports aren't likely diesel-electrics, solar power may not provide huge gains.
There is the idea of using huge kites to help pull them along when the wind is going in the right direction.