I saw a cool television ad today.

CSX railroad says they can move a car 434 miles on 1 gallon of fuel.
Putting freight on the rails, they can move 1 ton of freight 434 miles (IIRC) for 1 gallon of fuel.

Goes to show you how efficient trains are.
Apply that ton to people, and you can move 10 people 434 miles...
Or, 1 person 4340 miles, coast to coast and then some, with 1 gallon!!!

Kewl!
-John