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Corvette C7 fuel economy, 2014 Mazda3 sedan, Isle of Man

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Given the recent debacle regarding overstated fuel-economy estimates from Hyundai and Kia, we wouldn't blame the companies for being a little gun-shy about new vehicle releases. That just might be the case for the 2013 Hyundai Sonata and Kia Optima Hybrids.

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