So I changed mapping for muddy conditions to start with and did 23 miles of tight single track. Tight enough being the average moving speed was 14.5MPH....Anyway after 23 miles and a few tip overs the fuel light still didn't come on. I'm thinking it ought to get right around 50 miles on a tank for an average trail ride and safely about half that racing especially in sand washes, for example. The motor makes very good power for a stock 450. I left the snorkel in, changed the fuel screw, put on comp ECU, and added the GYTRexhaust piece. I'm changing the mapping to woods mapping and will see how it does then. I'm confident it'll make plenty of power for racing even in D38 where it is common to pull miles and miles of washes. The bike is very nimble and easy to ride. Stock valving is excellent and it seems I will only need to add heavier springs for my fat arse. I would like more fuel capacity, and sub mount for the stabilizer, and some full wrap hand guards....But I would race it as is.