There is an interesting explanation for this. Instead of thinking of apv what matters to your body is more the “retained alcohol” over a period of time. Your body can process something like a 4% beer every hour, so drinking one 4% beer an hour isn’t going to get you that drunk as your body is keeping up. Drinking a 5% beer though you start retaining 1% of beer an hour, but with a 6% beer you retain 2% per hour (twice as much alcohol) and you get twice as drunk. So for a 7% beer you will be 3 times as drunk. Rough math and everyone will be different, but you get the idea.