At the worlds in the main we started off at roughly 230 after warm up prior to the start and came off of the track at roughly 242 after the 1 hour final. So we were by no means running lean, if anything we ran a little bit richer than we normally would have liked simply to be on the safe side and because we were not trying to stretch run time.

Regarding the fuel comments that hustler777 mentioned you are correct a lower oil content will yield longer run times. The predominant reason behind this is that lower oil content = a higher methanol content in the fuel and methanol is a combustible material so the more of it you have, the longer that you run. Methanol also has a heat wicking effect when it vaporizes in the combustion chamber so more of it = a cooler operating temperature which means that you can run your engine leaner. Additional methanol also has the effect of providing superior anti-knock (pre-detonation) propertied comparable in essence to having a higher octane rating for the fuel which allows you to run a lower deck height or higher compression ratio with less likelyhood of detonation. This can/will improve torque quite substantially if you optimize for it correctly. So there are also additional benefits to be had from it in that area also.

Your comments about the reduction in smoke trail on the Sidewinder purple stuff though I find interesting as I found that it smokes more that I thought it would for a low oil content fuel. I think this has to do with having relatively low flash points for the lubricants that they use in it though. To me it seems like the oil burns off based on the engine internals appearing nearly dry after running in the motors that I took apart there which would confirm my thoughts on this. In any case though as you guys are probably getting from reading this there is quite a bit more involved in fuel development/testing than most people think lol! All fuels burn, it's really how in depth you go into the testing to figure out what the true benefits of one over the other are.