From what I understand, Stabil can be used in vehicles, however don't use it on a full tank. For example, run the tank dry, mix one gallon per instructions, pour it in, then let the vehicle start up and run a minute with that fuel. Once you take it out of storage, put another gallon of fresh gasoline in, get it to a gas station, then fill the tank. It wouldn't hurt to throw a bottle of injector cleaner in as well. You may have to change the fuel filter as well. The reason it could damage the vehicle is because most people use it wrong.

If you run a car with a full tank of the stuff, you will most likely gum up a few sensors, and kill the catalytic converter. However if you keep it to a minimum you shouldn't have any problems. I used that method on my dad's 82 vette before putting it into storage, we pulled it out a year later, loaded the tank with fresh gasoline, and ran a bottle of seafoam through the power brake booster's vac line, smoked for about 10 minutes, then ran fine.