We tow a 2015 Fusion Energi, as we fulltime RV. My question is how do you set the car up for tow. Is the ignition off or in accessory? Our manual stays to turn the car off, which we do. The longest we have towed without disconnecting or charging the car was three consecutive days, Las Vegas to Seattle, our battery was just fine after three days. My assumption is that with the car off the draw on the battery is the same as if it were parked. So why after 4 hours of towing is it dead, would it be dead after sitting 4 hours in a parking lot?