The U.S. is producing the most oil in 31 years, economic growth is picking up and crude prices are plunging. So why is Americans’ use of petroleum waning? As the U.S. moves closer and closer to energy independence, greater fuel efficiency, changing demographics and an increase in renewables are altering the dynamic that in the past would have seen demand for gasoline climbing. Gross domestic product, the value of all goods and services produced in the U.S., grew at a 2.4 percent pace in the third quarter from the year-earlier period. Oil consumption fell 0.3 percent, government data show. “Oil demand and GDP growth used to go hand in hand,” Christopher Knittel, a professor of applied economics at Massachusetts Institute of Technology’s Sloan School of Management, said by phone from Cambridge, Massachusetts, Dec. 8. “Now, they’re in some ways almost independent of each other because of investments in fuel […]