Ethanol has wrecked havoc with a lot of small engines. 10% blend has been seen to ruin gas tanks and engines on many motorcycles. Most motorcycle manufacturers recommend not using ethanol laden gas at all. Luckily non-ethanol gas stations do exist. Of course it does cost more, but you also see better mpg out of it.
Now as far as use of ethanol gas in RV's and possible consequences I have not seen any. I would not use a 15% blend though. As for rationing and shortages, the current higher costs of gas seem to be from our exporting of oil to other countries, versus a shortage.
