For this video, I rode as far to the right as possible, and you can see the results. The red car approaches, changes lanes, and passes me (:46) without difficulty. The SUV, on the other hand, although the lane to the left appears open, free for him to change lanes to pass, opts to scooch by me very closely (:56). The camera is mounted on my rear rack, on non-drive side, and my left elbow sticks about a foot farther into traffic than the center of this shot. The lens on this camera is somewhat wide angle, so he passed me very close indeed.
I could post similar videos except with me riding more in the center of this lane, but all you would see is this NOT happening. You might see cars occasionally riding my tail, gunning their engines, or honking, but that happens a lot less often than you would expect. The vast majority of cars do what the red car does in the video, when I send a clear message about what lane position permits me to ride safely on this stretch of street. On the other hand, the scooch pass is extremely common, if/when I invite it with a far-right lane position.
I was thinking about making three videos, riding in different positions, and I still will make some showing different experiences in this area, but this one illustrates the point: my lane position invited the SUV to scooch past me at 45 mph, so he did. That's an invitation I don't plan on issuing any more. It's not safe. Get up. Go ride.