Hello again to everyone. I have a question regarding tire-marks. This is my first year with a ZTR, GH 618 w. low-pressure Ag tires. Love the machine, gotta improve my technique. It took me a few mowings to get used to the steering, that is - to steer without ripping grass out of the ground. At first I was turning on the spot, causing the roots to be ripped out of the ground, then I made too big of a turn, causing lost time, after a few weeks I thought I found what works best - tight turns, just enough to allow both tires to spin and leave the grass unharmed while making efficient time. I didn't see any damage all year. Now that we've had blistering heat with a total lack of rain for an extended time (no, I'm not watering 3 acres), the lawn is showing many 'dead' areas. The grass has gone dead in some areas; upon further inspection I realized that it was only affecting the 'turn-around' areas, i.e. along the road, around trees, mailbox, etc. What can I do to avoid this in the future? Once again, the grass is not visualy damaged - ripped or stressed turf, it just seems to die faster where the mower turns or makes more passes. Thanks for any ideas.