Probably around 14 years old, when I found this site. I don't think I really considered it before that.
I also used my aero knowledge to build a CO2 car that beat everyone in my class. It may have also helped that my car was probably half the weight of everyone else's cars. They put several coats of paint on their cars, I put one. I think I also used graphite lube for the axles. My car got up to speed and stayed there, theirs didn't go so fast, and lost just like that.
Ultimately, my car got defeated because it was too low, and the guide line hook dragged on the ground and busted off at the end of the track. So no #1 school car, but I still beat everyone in my class.