The average American citizen will drink 44 gallons of soft drinks this year, and a good many of them will head off to the local 7-Eleven to fill up. In fact, 7-Eleven dispenses 38 million gallons of soda per annum. Why do so many of us wind up at 7-Eleven for a soda? Two reasons. The first is that 25 percent of us live within a mile of one of the stores.