Over the years I've owned 7 Z's from a 260 to Z32. I store them every winter from mid Nov to early May. I have never used additive and all I do is pull the battery and put moth balls around the outside to keep mice away. Cover them up, give them a goodnight kiss and see them in spring. I have never had a problem starting any of them nor have I had bad gas. I have 145,000 miles on the 94na and it runs like new. Unless you are going to drive it to "exercise" the entire drive train, you won't create any more wear by starting once in spring than 4 or 5 times throughout the winter storage.
