I work at an auto parts store and lots of customers ask me about these insane mileage claims on the labels of oils now. This has been a topic since the whole "Mobil1 Anuual Protection" came out and that's when it seemed all these oils started getting big mileage numbers on the front. And each iteration of the label design, the numbers get bigger and bigger.
My answer is always something along the lines of, "you should stick to the interval specified by your vehicle manufacturer." I don't follow my own advice with that for sure... when I had my 2010 Escape 2.5 I was doing OCIs about double what Ford stated to do. But, that was a naturally aspirated, not-direct-injected engine doing mostly highway miles in a moderate climate. I would never do such a thing in a direct-injected or turbo-charged engine.