Ford added a diesel engine choice to its 2018 F-150 lineup a week before the Detroit auto show. The Power Stroke name will be applied to a turbocharged 3.0-liter V6 diesel making 250 hp and 440 lb-ft torque while returning a claimed 30 mpg on the highway in Ford's best-selling half-ton pickup truck. “For every truck owner who wants strong fuel economy while they tow and haul, we offer a new 3.0-liter Power Stroke V6 engine,” said Dave Filipe, vice president global powertrain engineering. The new Ford diesel gets a graphite-iron block, forged steel crankshaft, aluminum-alloy pistons and a second fuel filter for extra fuel system protection. Peak power comes at 3,250 rpm while peak torque comes way earlier, at 1,750 rpm. A variable-geometry turbocharger increases responsiveness and reduces lag, says Ford.