I do the same thing. If the 2-stroke mix is getting near end-of-season and I have nothing for it to go in, it gets used in the next piece of 4-stroke OPE I have to run before winter. I try not to run it full-strength, like half straight gas, half 2-stroke mix if I'm able. If there's still some left over, it goes in my 1985 Ford pickup which doesn't really care what goes in it, within reason.