According to this article from, the eighth step to test drive a used car is to keep it reasonable.

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  1. 8. Keep it reasonable.

    The vast majority of testing done by automakers and their suppliers is performed in a manner that does not violate traffic rules. For the most part, drive as you normally would, just pay a lot more attention to what the car's doing. If you're buying a sports car, ask the owner/salesman if you can take it around a couple of freeway ramps at a bit more aggressive pace.