The Hershey Bar Car turned out to be really fast and won the Pinewood Derby. I think that having all of the weight in the rear and having a low center of gravity helped make this happen. My personal opinion is that the axles and wheels are most important part of getting the best speed possible. Well polished and true axles with good graphite as a lubricant is a must. Our pack does not allow increasing the wheel base but I am told this helps and running on three wheels helps reduce rolling resistance.
My car is the same as I usually make each time I am leading Webelos because it is the last year that the boys will be racing pinewood derby cars and I have the bus as a keepsake to remember them by. The photos are from their yearbook and all of the details on the bus are printed on decal paper. The bus is the opposite of the Hershey bar because it needs to be hollow to make it weigh 5 oz.