If one watches a few more episodes of the show, it would become obvious that the Prius fuel consumption test was a joke, like everything else in the show. Come on, we can do better than expecting a fair review of a hybrid car from a guy who comes up with increasingly witty descriptions of his erections caused by the power and speed of various sports cars.

Edit: it probably didn't come across like it, but I think that the show is hilarious and it is one of the very few reasons to own a TV. But a car review show (as in, the source of information on the automotive industry) it is not, and is not meant to be.