This, and other software like it, is why there isn't much pricing variance among US auto dealers in your area. Basically, it does a radial scan of inventories and tells the sales manager if his vehicle is priced right in his market.
http://www.vauto.com/franchise/used/products/provision/I have a very crude algo I use for pricing based on projected mileage. After scanning 50+ dealers and 5 aggregators over a 200-mile radius, I got the feeling that prices were a little TOO homogeneous. When I applied my algo to my top 3 picks the prices were all within 2.3% of valuation ($563 between pick 1 and pick 3) even though the vehicles were over 200 miles apart. And that was my **top** picks, the great bulk of them in dealer inventory were so in-line that I grew increasingly suspicious.
The sales manager I dealt with today fessed up and mentioned software like this.