FORGET HYBRIDS: Volvo is focusing on the diesel route to high mileage. But there’s a hitch: “Unfortunately, Volvo has no plans to introduce the Powershift or the diesel into the U.S. market. Apparently certifying the new engine for the U.S. market is too expensive at this point. And they’re unsure if there is enough customer support to back the effort. Too bad. We think both the transmission—and the diesel—would do quite well here.” Maybe we need to take a hard look at regulatory barriers to automotive efficiency?