its best to put the stabilizer in a jug with fuel and shake it before you put it in the tank. the grey marine stabilizer is better than the red. run the bike afterwards so the treated fuel is throughout the system. (with carbs, i drain the bowls) if you want, fogging the cylinders helps cut down on the corrosion with steel rings plus you can check out your plugs.
100% real/pure gasoline looses about one octane point per month. 'they say' ethanol fuels separate after a couple months. i avoid corn fuel but my cars are glass headlight old.
if you have mice, throw a dryer sheet or two in the tail pipe exit/intake tract. leave a note on your keys if needed
not a fan of battery tenders but i do charge then drive things 30-40 minutes once a month to cook the moisture out of the oil. there is usually at least one day without snow or salt to putter around.