Except for that one time, I've always run my PTs on 91, but I add Sta-Bil. I read a tech paper from someone who'd know (it was either an engine manufacturer, or oil company, but I can't remember which!) and they recommended sticking with 91 RON. The only exception is for smaller, high performance two strokes that rev. I'll use MotoMix for those. I thought that was a great way to part with my money until I read the patent and tech papers on that.
Funny about the mention of sulphur content in fuels. I cannot stand the smell of burnt 91. I can pick who uses what fuel in their car, and it's not necessarily a gift...!
I do love the smell of AVGAS on a hot day...bring back the TEL.
I don't collect mowers. I just require Multiple Mowing Solutions™.
