I treat the 318ti the same as my 1981 R100RS motorcycle and my collection of Opels, as they were definitely not designed for ethanol. That is, I avoid ethanol whenever possible or practical, knowing a tankful here and there probably won't cause any major problems.
But for winter storage, I think it's a good idea to have as little ethanol in the tank as possible. "Oxygenated" fuels seem to turn foul fairly fast (a matter of weeks sometimes), as opposed to ethanol-free fuel.
I've heard that ethanol is pretty rough on 2-cycle engines as well. Add that to the many "hidden" costs of burning corn EtOH....
-Kurt |