Sorry, that's an OWT. 80/87 had a MAXIMUM of 0.5 ml TEL per gallon. In
fact, due to the cost of the TEL and the ease of refining 80 octane gas
after WWII, 80 had zero lead.

Jim



We used to do that with our flight training airplanes. 75% mogas
and 25% 100LL to approximate the lead content of the old 80/87. But it
didn't work. We had sticking valves and worn valve guides.