The only reason I use high octane is because all the ethanol free around these parts is premium and I'm convinced that ethanol is the enemy of all two strokes.
Ethanol free gas isn't available anywhere near where I live at the gas stations but you can sometimes find it a lawn equipment service shop for about $9.00 a gallon. The manuals for all my newer gas powered tools recommend 89 octane gas with STA-BIL (for ethanol). I thought that higher octane gas has more ethanol in it, but I'm probably wrong. Even the aviation gas at the small airports around here has ethanol in it.
