JRscooby wrote:
Unless all 6 tires are wearing at same rate, scenario B will wear all tires faster, and likely wear the differential more than scenario A. At first rotation, the only 4 tires that are matched well enough to prevent axles spinning at different rates are the 4 that have been on the drive axle. If you split the pairs that have been running side by each, you will chew the tread off the more worn tire in very few miles, and that excess wear will speed up as it happens.
Maybe this is true but the difference is so minute as to not even be worth considering. Especially when you have six 10-year-old, barely worn tires.