Well, one thing; the small two-stroke engine just was not made to run on ethanol. At least, the fuel-system components are very succeptible to complete disintergration with only limited exposure to ethanol, and none of the additives prevent that, either. They may slow it but won’t stop it. Outboards that I have had did not suffer so much, but chain saws and weed eaters you have to dump the fuel out of and run ‘em dry, and still you get expensive damages in very short time. I hate ethanol. It is absolutely not necessary.
See Replies #26 and #28