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AddEPA says Mazda's 27.5 mpg average makes it most fuel-efficient automaker in US

Zoom-Zoom, indeed. Toyota may be the world's biggest maker of hybrids and Nissan may be making big strides on the plug-in front with increased sales of its Nissan Leaf electric vehicle, but it's Japanese automaker Mazda that has once again topped the Environmental Protection Agency's (EPA) list of most fuel-efficient automakers selling vehicles in the US, increasing its Model Year 2012 average by half a mile per gallon compared to MY2011.

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