Mythbuster's show 3/01/15 did a bit on reducing air pollution from a motorcycle through aerodynamics. While the premise was misguided I thought the show was interesting. I took several pics of the screen to try catching views of their project aero. They said they achieved 79 mpg. This is a good idea for improving mpgs, but while it helped reduce air pollutants it was no match for what regular cars are capable of today.