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    kenworth_2011

    Sept. 23, 2011
    ON A PLEASANT August morning, I’m behind the wheel of a bright red Kenworth T440 tandem-axle tractor rounding the test track at the Paccar Technical Center in Mount Vernon, Washington. It is one of several natural gas-fueled tractors I drove at the test track that day

    Related story: Natural gas gaining traction as fuel for milk, other food haulers