The Prius of the sky
A contest for fuel-efficient small airplanes has a winner: a modified VariEze that gets 45 mpg at over 200 MPH with two people aboard, and nearly 100 mpg at a lower "maximum range" speed.

Details from Wired here, Tree Hugger here, and the Aircraft Owners and Pilots Association last year here. Just as I've always said: to get America moving again, including on the fuel-efficiency front, we've got to get more people up in the air. (Thanks to Michael Ham.)