Bottom line for me is - I would not use Av gas on a street car. Race possibly. Than again, I would not build a street car that won't run on street (pump) gas. Other reasons = if it's got lead in it, it's illegal, They ( the airport by me ) won't sell it to me, and it costs 3 times as much as pump gas. Wooops, almost forgot, vapor lock is not my friend - kind of a moot point after the other reasons. Yes, I have tried using it in the past ( way past when it was not against the law to use it on the street and easy to buy ). Then again, you could buy Sunoco 260 for a 1/4 of the price back then also and totally avoid any vapor lock issues.