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http://www.businessinsider.com/americans-are-drinking-less-s... says 41 gallons per capita in 2014. Converted, it's 0.4252 liters per day, so a liter per day is more than double the average.

That's per capita; not everyone drinks soda. A liter per day could certainly be the average for soda drinkers.

I wonder what the difference is between mean and median in this case?

The standard deviation must be pretty high. There are lot people who drink almost no soda.