I'm not sure what to call this rear panel device - or if it has a name. I saw it on a diesel-powered Metro at the 2011 Green Grand Prix.
Question is, does it help? Sure is easy to put on the car.
What do you guys think??
That's a clear plastic panel, supported by a simple bracket at the center. The car is an X-Prize entry, by BITW Technologies. It scored 106 mpg at the GGP but I have no idea whether the rear plastic panel helped or hurt.