Mileage mandates and biofuels aren't silver bullets
The United States got on the right path right after the Arab oil embargo shocks of the 1970s by focusing on higher mileage requirements for cars and trucks. But the drop in oil prices in the 1980s drove the nation off course. In addition, Detroit's lobbying of Congress to get personal vehicles disguised as trucks - which were exempted from the mileage rules for cars - opened the door to the golden age of the sports utility vehicle and as a result the mileage targets became an empty promise. Consumption of gasoline just steadily grew.
Even if Congress had not created the SUV loophole, we would have …