Thanks for the video. Very cool.
My son raced on a public street as well, but the distance was only 100 yards or so (~100m). As he gets older, he can do the longer course, but it's still not very far or fast. Peak speeds for the faster kids is only about 28mph (45km/h).
For testing, I was envisioning actually taking it to a hill and timing how long it takes to travel between two specific points. Then you will have a quantifiable measurement for any change you make (like a new aerodynamic body). Basically, this would be a variation of the coast down tests that a lot of people here use.
http://ecomodder.com/forum/showthrea...g-cd-8402.html
http://ecomodder.com/forum/showthrea...test-2992.html