Vehicle manufacturers make much of the fact that their products come equipped with extended-life spark plugs that can maintain a precise gap for 100,000 miles. However, before you wait that long to replace them, you should bear in mind that spark plugs that hit the 80,000-mile marker are four-fifths worn. As the gap in the…

The Japanese automaker stands to be the first to use Homogeneous Charge Compression Ignition in a production gasoline engine.    

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