If you drive to a train station and commute to work, should you park in an outdoor or covered parking lot in the winter months? If you can, park in a covered garage. Since your car will be outdoors in the harsh elements for the better part of the day, by keeping it in a covered garage you're actually keeping the car a tiny bit warmer. This extra protection from the elements helps you bring the engine to the optimal temperature much faster, which means better fuel efficiency for your car.