Duratrax Overdrive ST.
After running for short burst at WOT and getting the truck to shift into second gear it will sometimes bog down and even stall. I have only used it in the street so far and have not let it go more than 150-200 feet away before slowing and turning around for another short run in the other direction. I have used 6 or 7 tankfulls of fuel. The air cleaner is still clean and oiled.