I was the culprit that mentioned this E85 issue. It is out there and sometimes it will specifically say that it is branded differently than the gas station you pulled into. Yes, it is quite clear that only "FlexFuel" marked vehicles should use this fuel and that leaves out RVs. Not that it is gospel but last year I drove a friends items in a Ford F650 UHaul to her new home in Nevada from Tennessee. There was a big sticker on the fuel tank (gasser) that said NO E85.