I have been going through two full sets of tires each year due to very bad inside wear on all four tires, but mainly the front set. The rest of the tread had normal wear, but there was an inner 1-2" wear that was horrible. I picked up my usual bi-annual set of tires about 8 months ago. This time I lowered the tire pressure in all four tires to 35-36PSI. I started to ignore the tire pressure warning light and I am still going strong on my 8-month set of tires with even wear on all four. Driving habits and roadway (mountain roads) commute hasn't changed.
2015 Model S 21"
2015 Model S 21"