Turns out the new Passat Sport is not the only new version of the German sedan coming to this year’s Detroit Motor Show (NAIAS). VW is also bringing the Passat BlueMotion concept, which is sort of the exact opposite of the Sport. This car is one of the most fuel efficient non-hybrid, gasoline-engined cars in the world.

The Volkswagen Passat BlueMotion is powered by a new 1.4-liter EA211 TSI engine with direct injection and turbocharging, as well as Active Cylinder Management (ACT) technology which turns the engine into a two-cylinder at low speed to save fuel. It also has stop/start system, and a DSG transmission that decouples from the engine when the driver releases the accelerator pedal, allowing the Passat to roll with the lowest possible mechanical drag.

Such drastic measures will invariably affect the car’s refinement. But on the upside, the Volkswagen Passat BlueMotion can average 42 mpg on the highway, while developing 150 horsepower and 184 lb-ft of torque.

Aesthetically, the Passat BlueMotion is distinguished by its Reef Blue Metallic color – a production color – and two-tone seats with blue stitching.