I have driven my RWD 85 for 117k miles now and one thing I noticed after so many miles is that the rear wheels definitely wear out faster then the front. Acceleration and deceleration is almost entirely on the rear wheels. I use regen as much as possible and avoid using the brake. While this leads to a conservative drive style it puts the entire load on the back wheels. My front tires usually last more than 50k miles, the rear ones only about 30k. I assume if I had a dual motor car the tires would last 40k miles and wear out evenly?