Interesting, makes sense... Problem is I don't want to have to continualy adjust the low end throught the day as the engine is coweled in an a PITA to do.... I think what you say makes sense as does the hot air etc... This is why I have to adjust the low end for winter and summer flying... I also think with the exceptionaly hot summer we are haveing, the fuel heating up in the can, that it is expanding (thinning it) and "burning" off the nitro... I think that is why a fesh can (cooler) of fuel makes things work again.. Can't afford a fresh can of fuel every day either... I am putting a cover on the fuel can this weekend ... Hopefuly this will help... Maybe keep the can in an ice chest... Along with the refreshments that is