I’ll gladly pay slightly more for unleaded 100 octane fuel. It will mean not having to worry about lead-fouled spark plugs, and the wasted time and money on cleaning/replacing them. It will also mean we can switch to synthetic oils and not have to change the oil as often. There are many benefits to getting rid of lead even ignoring any potential health/environmental issues. And I suspect that when produced in volume, the cost differential will be lowered somewhat.