How often do you guys start your car over winter storage?

I always let it get up to op temp...or theres really no point. Hence, why Im asking. Having to start it up once or twice a week and letting it run for 20 minutes each time can start to be a drain on the ol pocketbook. I guess I never really thought about it, cuz every carbureted car Ive ever had was a daily driver, so there was no "storage" period. I think Ill take some advice here and just go ahead and let her sit until warmer weather. Stabil is good stuff, use it in my tractor, generator, etc.