And I bet the report would show that the smaller the car, the larger the ego and degree of selfishness.
With the possible exception of Volvo wagon drivers, BMW 3-series drivers are the most irritating folks in the world. The 5-series folks are less so, and I have never yet encountered a speed racer or otherwise obnoxious type in a 7-series. (They tend to be Mercedes-like in their politeness.
Perhaps, because like S600 drivers, they have nothing to prove. They are the kings of the road, and know it, thus no need for show-boating.