To the OP,
Since you live in Ohio I recommend that you look for S&W fuel, which is manufactured nearby in Penna. It may be less expensive than Coolpower and the others because of reduced shipping costs. www.s-whobby.com Their "standard blend aircraft fuel" is 18% synthetic, 2% castor and comes in whatever nitro content you want. I use 10% in my 2-strokes and 4-strokes. The 2% castor has caused no problems in my engines, some of which are over 10 years old. And who knows, possibly the castor content has prevented bearings from rusting and prevented damage from a lean run.