I took the Leaf to Discount Tire to have a puncture fixed and wheels rotated.
They measured the tread remaining and said that there was too much wear differential between the front and back tires, and that they were not allowed to rotate them.
They had some signs up all over the shop to that effect -- recommend more tread in the BACK than in the FRONT.
My numbers were 5 and 5 in the front and 8 and 9 in the back. I assume this is 1/32's of an inch of tread remaining, but I could be wrong.
They did agree that the tires were "fine" and did not recommend buying new ones. This is good, because the curiosity-quote for all four was $600.
Considering the service schedule calls for 7,500 miles between tire rotations, and the car is at 8,000, this seems surprising to have them "ineligible".
So -- is this a ruse by Discount Tire to eventually sell more rubber, or unexpected wear?
Is this a consequence of my "grow no dash trees" policy?
If the fronts are wearing 2x as fast as the backs, I might be best off NOT rotating them, and just replacing the front two tires when they get low. This is similar to how my motorcycles wear -- two fronts for every rear replacement.
In any case, it looks like a three year lease is going to go through at least two tire swaps, maybe three.