Battery Drain on 2008 Toyota Tundra

If I leave my 2008 Toyota Tundra parked for more than three days, the battery is dead. Mechanic told me that there is a draw on battery, but doesn't know where. Anyone else have this problem and how to fix it.

Asked by for the 2008 Toyota Tundra
The battery can become drained if your truck has the auto-shutoff headlights feature, and you leave the headlight switch in the "on" position and rely on the auto-off feature to shut them off. The relay that shuts off the headlights draws power from the battery.
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