Kristen Riordan (I am not hiding names to protect anyone) told me that if your car is not moving, it will not consume gasoline. Gasoline, she told me, makes the wheels move. Anything your car does when it is not moving is via the battery. If you left your car sitting in the driveway, with the engine running, it would never run out of gasoline, EVER. She swore this was FACT.