- full can of SeaFoam (or your storage / stabilizer of choice) in the tank and fill before your last drive. Must go at least far enough to ensure it's gone through injectors as well. I see no need to store full of fuel, actually prefer 1/2 max so it doesn't take as long in the spring to run through and refill with fresh
- fresh oil change and filter, grease any fittings it may have
- fill tires 40-45 psi
- remove anything from the interior or trunk that may attract animals / mice etc
- at the very least, disconnect the battery. If possible, remove and store downstairs (on a battery tender is the best for it / not expensive to buy and will last for years).
- good idea to wash before it's last drive as well to remove bugs n any debris, only gets harder to remove in the spring
- when covering (outside or it) use a breathable cover only. Plastic sheet or non breathable cover will only promote mould in your interior
- don't start the engine while it sits over the winter unless your in a position to take for a decent drive.
- unless stored in a heated location, sheet of plastic down under the entire car will help keep moisture off it.