America's most popular full-size pick-up truck, the Ford F-150, will come with a compressed-natural-gas fueled option in 2014, according to reports. It will be "the first half-ton truck with dual-fuel capability," according to MotorTrend. "The F-150 with a 3.7-liter V6 engine will be available this fall with a $315 factory-installed, gaseous-fuel prep package that includes hardened valves, valve seats, pistons and rings so it can operate on either natural gas or gasoline through separate fuel systems," according to Forbes, but it will still need a pricey conversion kit, says Ford's Kevin Koswick.

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