If pinging is a problem couldn't you just add a little tolulol or xylene when you gas up. I know they are usually a major component in most octane boosters you buy at the store.
not to change the subject but, why couldn't our cars be designed to burn leaded fuel. If they were we could just go the airport and pick up some 100LL avgas. (100 octane with 2 ml per gallon of tetra ethyl lead and a trace ammount of TCP [tricreasyl phosphate] used to help scavenge lead oxides) It is popular with hotrodders since it is abundant, reliably free of contaminants and less expensive than race fuel.
