CHICAGO – The environmental and consumer advantages of vehicles with 15-year, 150,000-mile (241,000-km) emissions warranties – being launched with some models in California and Massachusetts for the '03 model year – raises the question of whether the high-quality fuel crucial to long-warranty components will be widely available in other states. Powertrain engineers and developers say other advanced engine and emissions-control technologies could be optimized with the guarantee ...

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