Mazda says:
Quote:
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"If we want to dramatically improve fuel economy from here, the only route is through lean burning"
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So says Mazda's chief exec for powertrain development, Mitsuo Hitomi.
Though he's talking about HCCI petrol engine development, not a "lean burn mode" in an otherwise standard engine.
Quote:
Mazda engineers aim to eke the gains by cranking up the engine's compression ratio to 18:1, from a current level of 14:1. Higher compression tends to improve fuel economy because they can achieve the same combustion temperature with a leaner mix of fuel.
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HCCI allows for more complete fuel combustion and lower nitrogen oxide emissions.
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http://www.autonews.com/article/2014...on-skyactive-2