Fyi
I have this "friend.."
Runs about 20% 100ll and 80% 93octane no ethanol automotive fuel in left tank. Take off and landings on right tank with pure 100LL.
He has a simple ethanol tester uses to prove no ethanol.
Cruise at 65 percent power 50 deg rich of peak. Runs great.. no issues.
(I would never do this of course) but my friend...
Anyone else have a friend with similar experience? IO360 A36BD?