Last summer I left my vehicle in the garage for three months. I put gas stabilizer in the tank and utilized a battery tender. The battery tender is very important because of all the electronics in a newer vehicle slowly will discharge the battery. One can be purchased either at Walmart or on Amazon. If you don't want to hook it up to the battery you can get an optional jack that can be plugged into the auxiliary plug in the car. I left my windows closed and had no issue.
I'm sure there are other things that you can do but that is all that I did to my car.
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