C J Campbell wrote:

The trouble is that the days of 100LL are numbered.

But nearly all of our engines can run just fine on high-grade unleaded. That's what
will be in the pumps a few years from now. Diesels are popular in Europe because
gasoline costs four times what diesel costs. They will also be a good idea for pilots
who fly to places where gas is hard to get, like some parts of Canada and Alaska. As
long as there's something at the airport or the corner gas station that makes an
O-whatever work well, and that fuel isn't significantly more expensive than diesel,
diesels will not be common in U.S. GA aircraft.

George Patterson
In Idaho, tossing a rattlesnake into a crowded room is felony assault.
In Tennessee, it's evangelism.