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Ethanol loves to absorb water, which is why things can start to rust when you let it sit. It's definitely a use-it-or-lose-it fuel. There are some seemingly decent stabilizers on the market, but who really knows how long they last or how they change the fuel. It's definitely best to keep things up and running. I recommend draining the tank during any kind of storage over a month long even with gasoline, no fuel lasts very long at it's peak performance when it's stored in an environment where air can get to it.
The black buildup is also pretty common in engines that use a lot of ethanol, best to have a flex fuel sensor and run it on pump gas now and then, the valves and injector tips will clean themselves pretty quickly.
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