I've had my 84 Carrera Targa for 20 years now. Every winter..I just park it in the garage and it sits until spring. No battery tender..no sta-bil..just leave the key in the ignition and it waits.
Today, nice weather and decided to get it out. It turned over the usual amount and fired right up. Ran perfect...as usual. (my clock even had the correct time!)
Not bad for a 37 year old car.