Out of interest why will AVGAS be a problem in the future? Refineries choosing not to produce it any more?
It's not only the lead content (which despite the "low lead" designation is allegedly higher than it ever was in any leaded automotive fuel....), it's the required costly infrastructure and logistics (e.g. quality control, dedicated supply vehicles and hardware) for a product were worldwide sales are dwindling to such an extent that it is almost not profitable to produce and market.