Availability of the new unleaded fuel is extremely limited. It is also very expensive. I also believe there may be a fee involved per airplane to use it (one time for an STC). The fee I heard is nominal $250.
I have never flown to an airport with it yet. i have probably landed in over a dozen different airports in the last few months with a leaded gas engined plane.
You still have to purchase the STC for your airplane serial number and engine(s) serial number. What the FAA did was approve that all-model STC as being valid/legal to sell and "install" (which is just placards).
I have never flown to an airport with it yet. i have probably landed in over a dozen different airports in the last few months with a leaded gas engined plane.