I got the lead out......Early real world report. 9A, O-320, Hartzell, Carb, Pmags, LOP almost always after initial climb.
UL94 is for sale just east of the home drome. $3/gallon, only 3 tanks of experience, so far. I run a mix of UL94 and mogas in my left tank and all mogas in my right tank. In my setup, UL94 acts just like 100LL at spring and winter temps. I'll watch it closely as temps increase to make sure it behaves similarly. Clearish in color, no real odor, clean plugs, nice price. No noticeable diff in temps or performance observed between 100LL/UL94/Mogas. YMMV
That said, the only issue I have had is with winter mogas, on a warm spring day. I had pneumatic lock on a fast turn, hot start, . This was easily managed with using the mixture knob on start.
If 94UL really has the same vapor pressure profile as 100LL, I'll be lead free all summer.