(http://media.il.edmunds-media.com/chevrolet/silverado-1500/2013/ns/2013_chevrolet_silverado-1500_f34_ns_41812_196.jpg) The bi-fuel option on the 2013 Chevrolet Silverado and GMC Sierra 2500 HD extended-cab pickup trucks will add another $11,000 to the bottom line, said General Motors on Tuesday.
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