If you can get it, gas without Ethanol is a better choice. Esso (Exxon) and Shell 91 and up octane here fall under that. Fuel stabilizer is also a good option. The salesman that sold me the car recommended parking on plywood instead of concrete. I never bothered before this year, but this year since I had some scrap plywood around (and new tires) I thought I would try it. And this year I added a cover to keep the dust at bay.
Overall, sounds like you are doing good. I am storing mine under the same conditions (unlike my bike - used to be 2, which gets stored in a heated shed).
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