Hi, our lake house is very near an airport. I just got fed up w/ fuel issues in the Spring despite treatments (no ethanol free in our great state except for the few stations that carry race gas). Pricey, but I don't use that much of it.
Synthetics don't, or at least the Mobil synthetics used in Mobil AV1, didn't adequately suspend lead deposits back in the day; the lead would settle out of the oil. Caused a fair amount of problems, but many owners never had any issues, I remember seeing a Lycoming with what looked like 1/8" of gray/black paint in the pan.
Interesting read;
AVWEB AV1
I do not know if any modern synthetic is better, and the VR1 is more than adequate.