The garage door has a reputation for being a huge energy consumer. Therefore we must weatherstrip it very well. It's also important that every door from the garage leading into the house be appropriately weatherstripped. This should help you keep the warm air inside the house and the fumes from your car in the garage.
Door Bottom
Door Set
Insulation Blanket

The infrared image clearly shows how the garage door is a major source of air heat loss. Even though this is a commercial garage door, it clearly shows where the warm air is leaking from. In order to solve this problem watch for the three (3) following elements:  

• Bottom of the door
• Top and sides of the door
• The insulation blanket