Very good thinking...Guys this is an important question that I was also thinking about. When I went for a test drive the dealer just pulled around a car and let me take it out ALONE. I put on 5 or 7 miles but I WASN'T GENTLE to it! Now let's say I buy a car and it comes with "only" 57 miles. Could be that this car was test driven by 12 different Yahoos like myself who all smoked the tires off lights and screeched around the offramps. NOW combine that thought with the common wisdom shown in owners manuals of basically "don't drive the car hard for the first [500-1000] miles to allow everything to "break in" properly.
In my mind, I want a car that HASN'T been on any test drives, personally.