The boost the efficiency of the GMC Terrain crossover utility vehicle, engineers bolted a six-speed gearbox to the 2.4-liter direct-injection four-banger. It sports an “eco model” that lowers the shift points, squeezing another mile or so from a gallon of gas for an [...]
Source: http://www.wired.com/autopia/2011/02/headphone-tech-helps-crank-up-mpg/
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