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A cylinder deactivation system helps trim fuel consumption.
The 140 PS engine also has a cylinder deactivation system (Active Cylinder Technology in Volkswagen jargon) that means it runs on just two cylinders under a light load, helping it to a combined cycle fuel consumption figure of 58.9 mpg and emissions of 112g/km of CO2.
It also gets a recalibrated ZF eight-speed gearbox, too, a smoother transition between four cylinders and eight (that'll be the cylinder deactivation system for better efficiency) and a new "Sport" mode.
The Passat BlueMotion concept employs VW's thrifty 1.4-litre EA211 direct-injected turbocharged gasoline engine, a dual-clutch automatic transmission, automatic engine stop/start technology and a cylinder deactivation system that lets the four-cylinder engine run on two or three cylinders when less power is needed to deliver 42mpg in highway driving.
And yet the car manages 17 miles per gallon in the city and 29 mpg on the highway, thanks to direct fuel injection and a cylinder deactivation system that shuts off four of the eight cylinders during freeway cruising.
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Cylinder deactivation systems, which shut down half of the engine when power demand is low, force the throttle to be opened wider in order to maintain sufficient power output from the cylinders.
Most of these deactivation systems seem to work if you're only heading downhill with a tailwind under a waning moon, but it's easy to coax the Durango into fuel-miser mode at moderate speeds.
Vehicles with fuel-saving six-speed transmissions or cylinder deactivation systems let a big V8 engine run on just four cylinders on the highway.
The V-8's cylinder-deactivation system pulls the GT's economy rating up to 15 miles a gallon in town and 24 on the highway, almost on par with 17/25 for the base car.
The Durango's new V-6 puts out a healthy 290 horsepower, but Dodge also offers a 360-horsepower Hemi V-8 that uses a cylinder-deactivation system to run on 4 cylinders under light loads.
Besides new models, some new technologies were rolled out at the show, including a hands-free liftgate on the Ford Escape, a back-up collision intervention system on the Infiniti JX, a new fuel-saving cylinder-deactivation system on the 415-horsepower Mercedes-Benz SLK55 and inflatable seat belts on the updated Ford Flex.
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