A single-vehicle collision last month involving a Tesla Semi electric truck took 50,000 gallons of water to extinguish and required aircraft to dump fire retardant overhead, according to a preliminary report on Friday from the National Transportation Safety Board.The crash, which occurred on California's Interstate 80 west of Lake Tahoe, is being investigated by the NTSB. CAL-Fire's efforts put out the flames cooled the vehicle's massive battery to keep it from reigniting and prevented the fire from spreadi ...