Instapundit:

IF YOU ORDER IT, THEY’LL JUST HAVE TO BUILD IT: White House Wants Up to 62 MPG Standards by 2025. That’s how economies run best, you know. When smart people at the top decide what we need, and order it built.

He links to this article at Gas2.org, but I agree with one of the commenters that the energy density of gasoline is hard to beat.