Because of the difference in the serving process. Pouring from a bottle tends to generate high CO2 losses (AKA head), so you need more to start with.
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Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk
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