Questions about mcii, i had both tires changed at the same time. I've put in 3629 miles, the front has 4/32 tread life, the rear has 8/32 tread left. From what I have found these tires start at 9/32 tread, based on the current rate i expect to change my front at 5080 mi, on my rear I expect to change it at 25,403 mi, or 4-5 front tires for one rear tire. I run my tires at 40 psi on my 96 800. Is there something that I am doing wrong. Depth was measured using a tread gauge.