Hey guys/gals, new here, thought I'd chip in my 2 cents.
Rac1201, you say you cut at 3 or 4 inches. Which is it? 4 inches is tall for lawn grass unless its in a shady area (higher grass has more exposed leaf to catch the available sun) or unless you're in the middle of a drought or the dead of Summer with temps in the 90's (higher grass will shade the ground better and help it hold moisture). In normal conditions with 6 or more hours of sun and with normal rainfall or watering, cutting at 2 1/2 to 3 inches may be better. It has been my experience that the matting down of the grass in the wheel tracks is partly because of the height and partly because the grass is too moist. Also, grass that is too moist is more susceptible to some diseases, so cutting it a little lower may help it dry out some and should help eliminate the wheel tracks. As someone else suggested, overlapping your rows by a couple inches will help eliminate the wheel tracks also. That's my 2 cents. I'm no expert, just a guy that's been from one end of the spectrum to the other (from not caring about the yard at all and letting it get way too tall and out of control to being obssessed with having a great looking yard and all points in between).