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That was my thought - how does this apply to a "normal" engine with tighter tolerances run under far less load and at much lower RPM? The video shows a specialized use case far removed from anything I will see.

You get better fuel economy in the summer because there is less air resistance. The air is less dense when it is warmer. That is the largest contributor to the change in mileage.

It seems to me this would explain the difference I observed. I had no other frame of reference since I had used M1 in this vehicle from the beginning.

Well, to be completely honest 8,500+ miles is not uncommon, over the years sometimes somewhat more that that when I have forgotten. But I have always used good oil and filters.

I have used Mobil 1 full synthetic for many years in a variety of vehicles. A couple of years ago I went to Wallies to get oil for my 2005 Sienna, and there was no 5W30 M1 in stock, so I picked up some Pennzoil Platinum. When I changed oil again, I noticed that the PP looked significantly...