Re: rodents - if possible, leave your hood up. It slows down the wire-chewing little varmints.
+1 on taking one battery clamp off. I store outside. After four months, I hook it back up and it starts right up.
I wouldn't worry about gas octane, but I might pour a pint of Seafoam into the gas tank and run the car a bit before storing it. Might slow down sludge somewhere.
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1993 Rockwood 28' Class C - Ford E-350 7.5L
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