[ANDY M]

I run my car on Sunoco 94 with a can of STP lead substitute and it runs fine. I also have a 160 thermostat so the motor starts with plenty of coolant in the block. The block is bored 100 over with standard TRW replacment slugs, and the heads are the steel L88 closed chamber square port.
At WOT there is no ping, and the motor runs strong enough to smoke the skins in all four gears. I have run it this way for 11 years, but the motor was rebuilt in '03.
Av gas is formulated for engines that run at max RPM for extended periods of time, while car engines don't. Better to use Cam 2 if you want to spend the extra money, or add a gallon of Cam 2 unleaded to a tank of Sunoco 94.
Most heads have hardened valve seats, so for street use unleaded will work fine and is more eco friendly.
JMHO