Been there done the 50% nitro thing. When the Nationals were here a few years ago most of the teams were shipping 50% here for the guys to use. Sure it helps make up for the loss in power you feel but it still does not make the tuning any easier when you factor in everything, and how fast weather can change here. All the 50% does is give you some of the power back your used to at sea level but it also is a lot rougher on your engine than a 30% blend of fuel is. In the long run I have gone back to 30% because my engines make plenty of power for me on the 30%, plus it's cheaper and the engines last longer. 5 gallons of 50% nitro thu an engine can take it's toll lemme tell ya.