Ok, I realize that allegedly it was not the OP's intent to talk about blind spots (although you could have fooled me with the title). But with my side mirrors damn close to all the way out, when a vehicle is approaching me from behind to pass, it moves from my field of vision in my rear view mirror, to my field of vision in my side mirrors, to my field of vision out the windows (either side). I continually have visual contact with a vehicle on either side of me.
Conversely when I am passing another, the vehicle moves from my field of vision out the front windshield, into my vision out the side window, into my vision in the side mirrors, into my vision in the rear view mirror. There is at no point an instance when I cannot see a vehicle anywhere around the perimeter of my vehicle.
Now, if you were to put something much smaller than a smart car or a motorcycle, like a mail box, right up next to my FJ by the pillar, I would concede that I would not see it. That is the only time I need to lean forward a tad to see that alleged blind area.