this might work....have you heard of this---

From the Shell Press Release:
Students from the across the U.S. and Canada competed today at the first Shell Eco-marathon(TM) Americas. Shell challenged the engineering students to drive their vehicles the farthest distance using the least amount of fuel, either conventional or alternative. While all of the teams accomplished impressive fuel economy figures, team Cal Poly San Luis Obispo won the challenge with an astonishing 1902.7 miles per gallon.

I think they turn the engine off after getting to a certain speed and coast. This is repeated over and over.

This would work in the worst case scenario.....just kidding.
http://engineering.curiouscatblog.ne...t-competition/