My dad ran AVGAS in the Dart for a number of years. It seemed like it really was corrosive on stuff. It eventually ate the valve seats out of the heads to the point the valves would'nt seal any more. I switched to VP 110 when I put new heads on and I'm a lot happier. I don't think it's a great race fuel. Not designed for that. The VP is only a dollar more a gallon here anyway. Just my .