I have always advocated the following for winter storage..regardless of vehicle type, or ethanol in the fuel.
full tank (reduces condensation in the tank), and use a fuel treatment (I usually used stabil). an empty tank (totally empty that is) is ok as well, but I would leave the cap off to allow air exchange and reduce condensation)
if possible, drain the carb(s), either by shutting off fuel and running until it dies, or using drains on carbs equipped. this is also regardless of ethanol or not. even pure gasoline will have evaporation and lead to gummy shiat , or varnish in the carb.
on 2 stroke engines a fogging oil is pretty much a must as well, 4 stroke, not so much. However a little oil fogging in the cylinders wont hurt a doggone thing, and will help prevent rusting from sitting.
fresh oil in crank case (do this before draining carbs, so you can circulate it).
disconnect battery, and keep it indoors if possible, or at least keep it from freezing... also, don't place it directly on a concrete floor, for some reason, that will cause it to go dead.. don't know why, but it does. sitting on a piece of wood, which is on floor is ok. and if possible, a battery tender.
on a 'heavy vehicle' such as a car, I would also put it on blocks to take at least 50% of the weight of the vehicle off the tires... been thru many tires that irreversabley flat spotted due to sitting 6 months with 4k lbs on them.
did all of the above on a few boats, couple of motorhomes, and sno-mobiles (call it summarizing, same steps), and cars.. never had a problem with them starting up in the spring
there are a lot of other things to look at if your going to do longer term storage, but that stuff above covers the winter stuff.
Last edited by michiganteddybear; 11-15-2014 at 12:02 PM.