My Sienna has traditionally chewed up tires. I usually get 50% at best of warrantied mileage. First I thought it was because I bought the cheapo 40K tires, but this is the case even with better tires. One 65K set (AT house brand Arizonians) got 20,000 miles. I always get great prorates because I rotate regularly, so that's not the issue--I go every 6-8K miles. My most recent set was Goodyear (at least 80K warranty), and I got 38K miles out of them (I could have taken them down a bit more, most or all were at 4/32, but I wanted something better for the winter rains we were having).
My question, however--would I get more tread life if I were to rotate them religiously every 5000 miles? Mathematically, if tread wear is linear, I'm thinking that it shouldn't matter. But the last time I went to Americas Tire, the guy suggested that.
I replaced the Goodyears with Cooper CS5 Grand Touring in January. The Cooper site says my size starts out at 11.5/32. I took them to get aired up at AT today, and he suggested that I get them rotated (after only about 4,500 miles) because the two front were 8 & 9/32, while the rear were both 10/32. FWIW, with these Coopers, I have maintained them at 42 hot (manual says 35 cold)--I have aired them up at least once between the time in January that I bought them, and today's air up.
So would 5000 mile rotations minimize tread wear in this application?