There are various past threads on Mogas (a search for mogas digs them out). I recall seeing info suggesting that with an appropriate design of the fuel system, optionally including the constant use of an appropriately located electric pump, you can sidestep these issues.
It is fuel temp/pressure not an OAT/DA limitation, I don’t know fuel temp at the pump but it is usually very cold and take time to heat up: so parking your aircraft in hangar, leaving tanks empty and quick fuel and depart will probably do the job on Mogas/UL91 temp issues…
Again load of aircraft that flies on airfields with mogas tend to have other own risks: single ignition, no mixture, no electric fuel pump, the kind to build hours rather than go to places…