A person's tastes are an outward expression of their personality. Of course, a person's tastes are also better displayed if said person actually has some money. If you have $657.32 to spend on a car, you're going to settle for anything that runs, whereas if you're the latest multi-millionaire the only limitation you have on your automotive spending is your taste.
Because of this, we posit that your dream car is a very pure indicator of what your personality is. That's why we've discerned What Your Dream Car Says About You.
PS: Before you take to the comments with your seething rage, please consider that this whole article may be a smidge tongue-in-cheek, and it's not intended to be the definite guide to psychological diagnosis by automotive preference... unless it is.