If you traveled by air over the holidays, you may have landed with a bit of green guilt. Conventional wisdom says that driving a relatively fuel-efficient car is usually better for the environment than flying. That may no longer be the case, though, according to new calculations from the University of Michigan’s Transportation Research Institute. Over the last four decades, driving has steadily lost the fuel-efficiency edge it once held over flying. In 1970, the per-passenger-mile fuel intensity for flying was twice that of an average car trip. “That is no longer the case for the average vehicle,” says Michael Sivak, director …
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Dan Haugen is a freelance journalist who writes about energy, business, and technology.