Sorry, but I have never been a fan of taking up a bunch of spaces, like others have pointed out, it just begs for unwanted attention and makes you look like an ass-hole, not only that, but makes all of us who drive high end cars look bad.
This is what I do, but of course, I don't take me Porsches to the mall (or my self if I can help it) that is what my truck is for...