Originally Posted by The_Jazz

Those numbers were based on the old system of calculating the MPG rate. Weather, road conditions and driving habits could make a huge difference in the actual rate.

I'll bet this guy drives his Prius like he drove his Mercedes, which means inefficient. I also can't really imagine that S.CA is a particularly good venue for the Prius given the amount of traffic. Having lived in Riverside and done a lot of business in Ontario, I can confirm that everything backs up pretty well at rush hour there.