Before I discovered Wildcat fuel, I tried all kinds of other brands and I had endless frustration and engine problems. With other brands of fuels, I was always sending my engines in for repair. After I switched to Wildcat 18% premium, all those problems went away and the "FUN" factor went way up. I use the same fuel in my 2 and 4 stoke engines and I fly alot. Thank you Wildcat Fuels for making flying so much more enjoyable.