what brand do you use? I am running a maxx and xtm buggy, 20% is good enough for me but what brand is good and cost effective without ruining the engine? thanks!

I went from Megatech, Sidewinder, Blue Thunder, and then Odonnell. The OD runs much better in all my engines compared to the rest. Other great fuel is Byrons, Trinity, White Lightning, Maxy, RB, Mugen, etc. I basically run what my LHS will have in stock for a while.