i think the point we all agree to is that b/c diesels never caught on as they have in europe and the fact that fuel cells are getting ever so closer to being mainstream that we should not shift our infrastructure in such a short term over to diesel hybrids or biodiesel fossil fuels...gasoline is the most widespread and is cleaner than diesel as much as the diesel lovers object...an otto cycle engine hybrid powertrain seems to be the least costly short term solution allowing the auto mfgrs and other industries time and more money to make a quantum leap in fuel cell technology...the days of fossil fuels are hopefully numbered