Sounds to me like someone has a bad case of HUA. Gasoline, even poisoned with ethanol, is preferable to either AvGas or Coleman Fuel for a lawnmower or weed whacker. If you're concerned about it, shut the fuel valve off and run the carb dry after each use. If you're REALLY paranoid about it, use an additive like Sta-Bil. We use the latter at work in our gerry cans and it'll keep E-10 fuel usable for a little over a year.