Because as far as I know the engines must have their type acceptance updates to ...

mlyle · on Oct 20, 2021

Yes, technically speaking.

Swift charges $100 for a STC, and has coverage of two thirds of the GA fleet.

Really, all that needs to happen is an airport needs to decide that lead free is important to them and they'll pay the premium for Swift's fuel.

Blackthorn · on Oct 21, 2021

The slow uptake has more to do with it just not being all that available.

mlyle · on Oct 21, 2021

Yup-- why should an airfield bother with going to 94UL when it's more of a hassle (some planes can't take it, all planes need an STC).

But if you taxed the crap out of lead-containing fuels, I suspect more would be interested...