I do the same, but use non-ethanol anyway, cheap insurance. I run the stuff in my old truck too, I don't drive it much, and no petcock! :) For mopeds I make a 5 gallon Jerry can of pre-mix at a time. Top off after every other ride or so, easy. The oldest moped I have owned since '98, cleaned the carb when I bought it, not once since, and it is a Hobbit. Empty bowl, starts every spring. They put a petcock on these things for a reason, use it.