All sports fans like stats and more stats. Here's one to chew on: the average American wastes four gallons of water a day when he or she brushes her teeth. That eye-popping number was enough to convince Colgate to spend millions of dollars to create and run a 30 second spot during Super Bowl L. The company will use its time on the national stage to tell viewers to turn off the faucet when they brush their teeth. The “Save Water” ad originally appeared in Latin America, and it ran on TV in t...