Or, to expand on this, a gallon of oil makes a car go dozens of miles, while a gallon of water won't even flush a toilet; volumetrically, the US uses about 50 t

Or, to expand on this, a gallon of oil makes a car go dozens of miles, while a gallon of water won't even flush a toilet; volumetrically, the US uses about 50 times as much water as oil.