MBTE was originally mandated in gasoline by the EPA in major metropolitan areas that had smog problems. When it was phased out ethanol took its place. That's why you only find stations selling ethanol free in predominantly rural areas. I've used e10 in Brit bikes for over ten years with no significant problems. I do use the stayup floats, new Amal internals, modern petcocks and gas line. One bike has a por15 treated tank and has had e10 in it continously for over ten years with absolutely no deterioration. IMHO like the loss of lead, the problems with e10 may be overstated, excepting fiberglass tanks.
I should also add I am against ethanol for a host of other reasons, it's gouging the taxpayer/consumer and enriching big ag and it's an environment disaster. Google the "gulf of mexico dead zone" and you can see the impact of increased runoff and pesticide use on marginal ground in the midwest. It also doesn't seem right to burn food in vehicles when not everyone on this planet is well fed.
