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How can headphone technology increase a vehicle's fuel economy? Well, the truth is, it can't. Not directly, anyway. However, by employing an active noise cancelling system similar to what's used in some of today's high-tech headphones, General Motors solved a problem that would've otherwise plagued the GMC Terrain. In doing so, GM managed to squeeze another mile or two out of each gallon of gas put into the Terrain for an EPA rating of 32 miles per gallon highway.

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The new 2010 Chevy Equinox that was unveiled at the Detroit Auto Show has an interesting new bit of technology that aids fuel efficiency even though most people wouldn't think of it that way. When the engineers were working on the calibrations for the new 2.4-liter direct injected four cylinder engine, they were able to get some significant fuel economy improvements by lowering the idle speed and by lowering the speeds at which the torque converter locks up. Unfortunately there were some downsid

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