I cannot give you the details or the science behind it but I have heard folks say that the Avgas is blended for high altitude use and that makes it less than optimum for race cars.
I had a friend that was an engineer that said Avgas burned too "dry". I don't really know what he meant.
I always like hearing this, its for high altitude. Pretty sure all airplanes take off from the ground and also pretty sure taking off takes more power than actually flying. I use it, and love it. 12 to 1. The car doesnt get driven much, so when the fuel evaporates, it doesnt leave any "goo" in the carbs. You have to jet up a little, not much, but some to make it run right. Carry on. It was 4.50 a gallon at the airport near me. LOL
