30% HOLY CRAP WHAT ARE YOU DOING?ANYMORE NITRO AND THAT THING WILL GO BACK IN TIME. I'VE HAD MUCH MORE SUCCESS WITH MY 140DZ RUNNING POWERMASTER 20/20. OS TYPE F PLUGS.I FLY AT @3500 FT IN DRY DESERT AIR AND CHANGE A PLUG MAYBE ONCE A SEASON.I AM NO EXPERT ,BUT IV'E BEEN RUNNING MY 140 FOR 5 YEARS ?I JUST THINK THAT MUCH NITRO IS ASKING FOR PROBLEMS WITH THE 140.........GOOD LUCK