adding additives to gas tank to forestall ethanol problems

2oldman is correct. Many small engines like generators, lawn mowers, blowers etc. are experiencing problems with ethanol destroying the fuel lines and diaphragms in the carburetors. I use stabil in my gas truck. I use marine stabil in my boat as I'm told that ethanol attracts water. You should be fine with regular stabil in your MH. I like Seafoam for the small engines like the generator.