The diesel proved to be more efficient than the petrol-hybrid, by more than 3mpg.
Perhaps diesel-electric hybrid cars are the way to go. Plus you could run them on dead cats (http://slashdot.org/article.pl?sid=05/09/14/2355
And for the record, I work from home, only going into the office on average about 1 day a month. When I do go in, I usually carpool to the park-and-ride, take the bus to catch the ferry and then walk the rest of the way to my office.