[Silveredwings]

The way I read "The Only Way to meet the requirements is to lower vehicle weight" is that they'll have to do a lot of things to meet the requirements, but they won't be able to exclude reducing the weight.

Heck, I bet they could get the first 10% by sticking a manual tranny back on cars and putting in a mpg readout. How about tire pressure monitors. What I'm saying is there is a lot of low hanging fruit that they could do that neither requires nor precludes fundamental efficiency changes in drive train or the glider.