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They do. Direct injection on Audis allows for stratified direct injection (ultra-lean) in Europe... it's only in the US and other markets with piss-poor gas or strong NOx regulations where they can't do it. Most modern engines are already very lean-burn at part throttle. Most DI engines are ultra-lean. And many upcoming engines promise to run even leaner... can't wait to try out Mazda's SkyActiv.
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