>Avgas is high octane gasoline and will do pretty well in your gasoline >engine. It's been so long since I bought any that I couldn't even begin to >guess the price. It comes in two main flavors, 80 octane and 100 octane. AVgas also contains lead....quick way to trash your cat. Most parts stores sell octane booster (nasty stuff, though...not supposed to get it on your skin, etc.) Mark