My baby is garaged at night, but she's all alone out in public parking lots all day (and, due to my job, often until midnight or later.) Maybe it was an unnecessary bother, but I had an ignition kill switch installed: I figure the harder I make it, the more likely the crooks'll go on to some EASIER target. Plus, being the psycho I am, I've always locked all my cars up tight. (Yes, including when I get out to pump gas!)
No guarentees, of course --- like a couple people say above: if they really want your car, they WILL get it --- but anything I can do to make it less-likely they'll succeed, I'll do. And, too, I'd rather come out some night to find a broken window than a stolen car!
