[SubaSteevo]

Maybe its just the gamer in me coming out, but a simulator (i.e. really cool video game) of the car would be awesome (if for a sporty car). Something like a top speed demonstration, or a 0-60 demonstration, something you wouldn't want them to try out in the REAL car. I know one car company (I forget who) is giving out a version of Gran Turismo with just the promotional car in it.

...or you could always just have people live in the car and the last one to leave gets it free.