One of the biggest changes to hit aviation in 116 years is at our doorstep, the discontinuation of the de facto aviation standard fuel, 100LL, as the EPA and others draw the line on aviation’s use of lead in our gasoline. But there are many questions? What will this fuel look like? Who will make it? Where will we get it, and . . . how much will it cost? Plane & Pilot’s James Wynbrandt digs down and finds the answers to these and more questions about the fuel of our future.