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When it comes to cars, newer usually (but not always) mean more efficient. The airline industry, though is taking a look back at turboprop planes as a way to save fuel. As Marketplace reported the other day, the smoother and faster rides provided by jets are also more fuel-thirsty than planes powered by giant spinning blades. Therefore, more and more airlines are adding propeller-powered planes that, according to one Continental representative interviewed by Marketplace, are 30 percent more fuel