The Dart is now in hibernating

I leave the least in the tank as possible. That way there isn't that much to
go bad. Put the car up on blocks, disconnect the battery and cover it up.
I don't touch it till spring. Then put in fresh gas and fire it up. Haven't had
any problems doing this for over 10 years.
You don't change the tempature in the garage. You won't get the moisture.
I do put some cheap dryer sheets in the interior, trunk, under the hood in
the tail pipes and the wheels to keep the mice out. They don't like the smell.
Don't hurt to put some mice poision around.
I put our Duster and our Dakota R/T away that way every year.