Electric Aircraft - The Thread in General Skydiving Discussions 3 hours ago Within our lifetimes the petroleum industry is going to stop refining 100LL aviation gasoline. Then we need an alternative to keep flying. Consider the Romanian Air Force's dilemma back in the early 1990s. After the fall of communism, Romanian refineries stopped making 100LL and it was prohibitively expensive to import 100LL gasoline from Greece, so the RAF grounded their fleet of I.A.R. 823 trainers. Those trainers were powered by the same Lycoming IO-540 engines as Cessna 182 and 206. Those airplanes sat idle for a decade or so, then were bought up an American dealer and sold on to the warbird crowd, who were wearing out their similar-sized Beechcraft Mentors. Debate all you want, but DZOs are going to need new a fuel source within the next 20 years.