Ford messed around with lean burn V8's in the 1970's.
The Ford Proco Engine Update . They had direction injection, stratified charge, two plugs per cylinder, and EGR to reduce NOx. AFAIK, the engines never made it into any production vehicles.
http://www.blueovalforums.com/forums...-proco-engine/
Just like Toyota, Nissan dabbled in lean burn, but never sold any such cars in America.
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Originally Posted by Wikipedia
The QG engine is a 1.3 L, 1.5 L, 1.6 L, 1.8 L, and 2.0 L straight-4 piston engine from Nissan. It is a lean-burn aluminum DOHC 4-valve design with variable valve timing and optional NEO Di direct injection. The QG engines were designed for Nissan by Aichi Machine Industry.
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Nissan QG engine - Wikipedia, the free encyclopedia
I don't know how lean these engines burned or how much gas they saved.