Well, since no one else has answered this very important question yet I'll assume I'm the only physicist on the board, and it is therefore my obligation?
I am happy to report that I recently bought a RED FGT because RED is definitely the fastest color traveling through a medium other than vacuum, i.e. air. This is because it has the longest wavelength of about 700 nm.
Now one of you brillant forum members might ask about white, well white is sum of all the other colors, RED being fastest and the others slower, so clearly slower than the pure RED speeder!!!
Just sayin'.....