[redwitch]

Larry, I understand your fear of liability but why in heck would someone watching your house drive your car? There is no way I would even consider doing that (well, maybe if it were Testarosa but nothing less), let alone do it! I think the same would be true of any service. It's just not worth the risk and loss of business to drive someone's vehicle. Write down the odometer mileage (better yet, take a picture of it), let it be known that you did so and then don't worry about it. Obviously, you would know they did in fact drive your car without permission and, if they did, I'm sure you could report it to the police and press charges for, at the very least, joy riding.

I do understand wanting to protect yourself from liability but why hire someone if you can't trust them? Or, as Sidney said, asking a friend you can trust? (Personally, I'd trust the service more than a friend because a friend might use the logic that a quick trip to the store won't hurt.)