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Weird thing about tires. The rolling diameter stays fairly constant over the acceptable pressure range.

Under inflated the tread acts somewhat like a tractor tread and even though the axle center height is lower then the nominal radius, you still get the same effective revs per mile.
The tread only expands upon significant over-inflation.

The typical for 4WD/AWD systems is 3% effective rolling diameter and that is often as much as 1/2 the tread on a tire.
No harm in being conservative but almost no way 2K miles would exceed a fraction of 1%
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