I should mention that the 93 octane I drained from the 68 was fresh but had ethanol in it.
I remember talking to the guy in a lawn mower repair shop about 20 years ago when I was buying a carb rebuild kit. He said to use non-ethanol and fuel stabilizer in my yard equipment so that's what I've been doing. It took me a while to find non-ethanol and the octane is not marked on the pump but I'll have to ask this week when I get some more. It's a couple bucks more than regular so part of that may be due to the higher octane.
