Of course, I'll have to check with the FAA that UL94 is approved for Continental O-300 engines. I'm dubious and unwilling to take a chance. Unleaded AvGas has been "being worked on" for quite some time. However, and this point cannot be overstated, the auto industry could move faster because they never had to contend with the FAA. The FAA is lapped by glaciers routinely.