For years, we'd been setting our side-view mirrors so that they gave us a view of the back corner of our cars. This is the way it's been done for generations - from grandfather, to father, to us! But we finally discovered something very interesting. The back corner of the car never moves. It always stays in the same exact place. So there's really no reason to keep an eye on it.
Sounds obvious. So why didn't anyone think of this before? Setting the mirrors this way makes for far smaller blind spots. That's especially useful in the U.K., where drivers make it a habit to either hang out in your blind spot, or change lanes in them. We'll have to make some adjustments in the instructions, though. The driver sits in the right-hand seat here.