(http://media.il.edmunds-media.com/chevrolet/silverado-bi-fuel/2013/ns/2013_chevrolet_silverado-bi-fuel_f34_ns_30512_196.jpg) As gas prices soar and take center stage in the nation's political debate, General Motors on Monday said it will make 2013 Chevrolet Silverado and GMC Sierra 2500 HD extended-cab pickup trucks that can run on natural gas and gasoline.
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