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Rising costs at the pumpmay empty your wallet,but they could be a boonfor your waistline, saysCharles Courtemanche,an economist fromWashington Universityin St. Louis. "When fuelis expensive, peopledrive less and walk andbike more," he explains.Courtemanche speculatesthat if prices go upanother $1 a gallon,obesity rates could drop15 percent over fiveyears. To get the benefitno matter what thenumbers at the pump,try running more errandson foot or by bike.