once you get the few rubber parts swapped out, it does no harm, I have been using it since it has been introduced with no problems. The only problem I have had with ethanol is it dissolved the gas line in my weedeater. if you are leaving the truck sit for long periods of time just use stabil and some 2 stroke oil, my dad found that out on accident when he used the weedeater gas in the lawnmower too, the tank stayed pristine. And then in the spring it might smoke a bit, but probably not.
