Nissan's new "Diesel Runner" mid-sized diesel-powered concept pickup is based off its Frontier Desert Runner 4x2 model. Revealed at the 2014 Chicago Auto Show, the OEM said this concept truck is designed to gauge "market reaction" to a Nissan diesel-fired mid-size pickup as well as help plot the potential future direction for the Frontier. The prototype is powered by a 2.8-liter turbodiesel developed by the Cummins Technical Center in Columbus, IN. All photos courtesy of Nissan.