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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.

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> 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.

What is $250 in aviation terms? It's nothing.

Availability of fuel is a concern, sure. But a fire has to be lit on people's ass, otherwise they will not move.

the requirement for the STC on a per-aircraft basis is now gone AFAIK. That was the effect of the FAA's "legalization" last year.

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).

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