For me, it's probably just a matter of temperature. The kegger is in the garage & it gets colder out there in the winter than what I have the kegger set at, so the ale lasts longer.
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