This talk about avgas is very interesting and also illegal to run in your car by federal law. Thats why most airports wont sell it to you. We ran it all the time in the dirt track cars I built engines for. We bought in in 55 gallon barrels and claimed it was for crop dusters. We found by adding a quart of auto transmission fluid to 15 gallons we replaced the top end lubricant that avgas doesn't have. Don't know if that last part was true but it didn't hurt either.