Worked in refineries for 12 years, been around hot rods for about 20 yrs. I understand the differences between 87 and 93 and what they allow in conventional 4 cycle engines. That being said, I remembered today while I was filling up my 2 stroke tank, that when I bought my shindiawas the red max poster said "89 octane, ask us why" I didnt, but now Im wondering, why? I run 93 in my go-devil with a 23 vanguard cause I was told its a high compression engine (my idea of high compression and Warren Coco's are different lol) and no more gas than it burns why now? My primary truck has a high compression bla bla. it NEEDS 93 octane, people ask why you use that expensive stuff. At the time there was a 10 cent difference between grades, so 20 cents difference from 87 to 93. Thats about $5 per tank, and the way the truck runs, it NEEDS 93. Whats the reason for running higher octane gas in these 2 strokes?