Fuel stabilizer is absolutely not needed unless the fuel in your tank is already many months old (not likely). Bumping tire pressures up to the top of the normal range makes sense. I see no need to go above 40 psi. unless you have known leakers and already pump your tires up several times each month. My summer car sits in the garage for 2-4 weeks all during the winter. The only thing I do is try to drive once a month....and float the battery every couple of weeks...but even that isn't needed with a monthly drive.
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