[Christ]

Of course, I was assuming that all suspension parts are at OEM spec there. It's too difficult to accurately say what happens when things get worn, because no two worn parts will perform exactly the same, so it becomes a matter of speculation as to exactly what's going to happen in that case.

If you refer to physics, there is a motive force rotating the tires, but friction is attempting to stop that motion (equal and opposite blah blah blah). Under cruise conditions, the front tires (ideally) should be at 0 toe for less friction during cruising, and less power/fuel consumption. In order to achieve this, slack has to be "built in" to the suspension system (see: rubber bushings) so that the road surfaces frictional stress on the tires approximates a 0 toe angle. IIRC, most OEM settings call for toe IN to compensate for this, and adding stiffer/solid suspension bushings means you have to compensate for the lack of motive capability of the suspension now, so you should be closer to 0 toe from the get-go.

Is this incorrect? It's how I've always understood, but I'm not a suspension engineer by any means.