Hot day? CHTs? Cowling/cooling air flow? Fuel lines plumbing/routing? Fuel system design? Similar failures with 100LL?
There have been many like tens of thousands of event free hours flown on mogas using both EAA and Petersen STCs. Anecdotes do not an exception make and correlation does not imply causation. A pilot I know had an E0 fueled loss of power too, but I doubt it caused the intake balance tube to crack venting the intake to the atmosphere at 60 hours past overhaul.