Not having much faith in octane boosters, I run VP fuel in a car. I can't get it from a pump locally so I buy in a can. Picking the right one took some reading and experimentation as there are a LOT of different VP fuels with significant differences. For my car, it came down to octane rating (of course), oxygenation and vapor pressure. Aviation fuels have a low vapor pressure by design. Starting a car on a low vapor pressure fuel can be problematic. Justifying the price for racing fuel is also problematic.
https://vpracingfuels.com/product-category/racing/racing-fuels/