I also noticed that there is quite a bit more smoke and the smoke seems to linger. Where as before with store bought fuel that used sythetic oil the smoke would quickly dissapate. 8% oil does seemsto be a bit on the low side I might go with 10% next and see how that works. The O'Donnel race blend I was using only had 8% synthetic oil in it which is why I went with just 8% with this blend. I need to get new batteries for my temp sensor I am curious to see how warm the engines get on this homemade fuel. I am going to tweek my tune tomarrow I am expecting to see at least equal permorance compared to the store bought 20% fuel. tongiht the engine did seem a little more sluggish from a dead stop but top end seemed nearly the same. But I think it will be just as snappy once I lean it out just a bit.