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Nissan Frontier Diesel Runner

The Cummins diesel-powered Frontier Runner technical study is unveiled during the 2014 Chicago Auto Show. While the Titan will get a 5.0-liter V8 turbocharged Cummins diesel engine, the Frontier may be in line for a 2.8-liter four-cylinder turbodiesel, also built by Cummins.Michael Tercha / Chicago Tribune