Here in Benton County AR due to bad weather I let my Scat Pack sit about two weeks.
Last time I drove it -- just before the 1st of two snow storms hit -- was Feb. 7. Then didn't drive it again until Feb. 20.
In the meantime the area got hit by two fairly bad (for this region) snow storms.
A pic after the 1st storm:
View attachment 1015276
After the 2nd storm passed and after some days -- the weather remained quite cold -- the roads finally were clear. But I had to deal with an apartment drive that was not plowed so I didn't take the car out until the weather warmed up and melted the worst of the snow/ice from the apartment drive.
A view of the apartment drive from inside the car:
View attachment 1015275
Have not looked that close but if any salt residue is on the car I'll just rinse/wash the car off. I know my "daily driver" (my van) has a good amount of residue because I used it before the roads were clear.
As for fuel stabilizers I posted a link to a video of a guy who tried various fuel stabilizers for a year and believe it or not the test engine with just plain old 87 with no fuel stabilizer started the quickest. In one case with a popular fuel stabilizer the engine required considerable effort to get started. Once started it ran lousy.
The one I recall the engines were started after 1 year of sitting -- but were started (as part of the test) at 6 months -- but this one has the engines being started (again) after 13 months.
The take away is from the video is fuel additives do not work and in some cases can make the engine harder to start and make for a lousier running engine once it does start.
As for using the car vs. letting it sit, if the weather is real bad, if the snow is bad, and if you do not want to fit real snow tires to the car, best to let the car sit out the bad weather. Or if you just do not want to subject the car to the "ravages" of winter or the risk of an accident from some doofus not on the proper tires then let the car sit out the bad weather. Really your call. And you can use any reason you want to let the car sit.
My experience has been from living in areas where bad weather is not a given for long long periods (months) so even after a week (or two ) of bad weather, intolerable road conditions -- my Scat Pack is fitted with summer high performance tires -- the weather breaks the roads clear up the temperature warms up some and I can bring the car out for a nice long (~1 hour) drive.
Typical for me is when I used the car the last time before the 1st of two snow storms hit I put the car away after topping up the fuel tank with fresh 91. It so happens it was ethanol free 91, but I have lived in another area -- several hundred miles north of here -- where 91 ethanol free was
not available -- or if it was I was not aware of it and never bothered to seek it out and use it -- and the presence of ethanol didn't seem to matter in any way I could tell. The engine started and ran just fine even after at least a week or two of lack of any use.
I bought the car new in Nov. 2020 and on January 5 I had the oil/filter service done at around 1500 miles. So the engine is "facing" winter with infrequent use with fresh oil in the engine.