Well again its a little wooly here! Generally you'll find a figure stated of tow in from 0' to just under 3' I set mine at 2-2.25 tow in. my car drives comfortably and true at this setting so that's where I stay. I'm happiest at 2' after rolling it back and forth and rechecking though it usually shows just over 2' I always keep an eye on the wear pattern to the tyre though and after a couple of thousand miles if I have any wear to any edges and I'm talking micro wear, I adjust both sides by half a turn to the track rods and find that trues them up nicely and I don't need to adjust them again! So in true answer I probably run with about a 2mm longer distance between the rear rim centers than the front rim centers.
