i know i am new to this fourm. but i have been in rc for a little over 8 years now. i have ran several fuels from the top fuel to byrons to nitrotaine to sidewinder to the blue thunder. all the fuels i have used were good. with the blue thunder i never had any cooling issues unless i had an air leak on the motor. the reason i don't run the top fuel or blue thunder anymore is i am in the racing mode and my engines and myself seem to like the way the sidewinder 30% world's blends acts. but with my first t-max 2.5 running top fuel i got 5 gallons before exchanging it. then i tried the blue thunder "BREAK-IN" fuel and used it. it was good for breaking in a 3.3 traxxas motor alot more oil then the top fuel. and i ran blue thunder 20% for awhile until i got drug into the raceing aspect...i am sure you all saw my arm being twisted right?...then i started using sidewinder and byrons. but with all the fuels i have used it depends on what type of running your going to be doing? racing...i would say sidewinder, byrons, o'donnell etc etc, for bashing top fuel blue thunder, trinity fuel along that line. i have yet ran into a bad fuel. alot depends on your tuning ability and skills.