automotive x prize, has anyone seen interesting methods for FE
 

Hi All,
I am just wondering for people that are following the automotive X prize. Has anyone seen any interesting techniques or methods that any team is using to obtain better efficiency.

I have done a quick look at some of the teams but i have not been able to find any detailed info on how any of them have achieved their high efficiency.

I guess if anyone has heard or seen any teams achieve better efficiency using any techniques which aren't in the 65+ list of mods then please post, maybe some methods are worth including in the list.

The name of one car is a clue. ;) VLC = Very Light Car.
Also, very aerodynamic, and small engine. Those three give the biggest gains.