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Originally Posted by serialk11r
Well, keyword SCR.
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Yup. Whatever it takes to keep trucks from "producing far more NOx than a passenger car ever could".
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With SCR, gas engines would be doing a lot better than they are right now.
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Nope. Gasoline engines use a 3-way catalyst to very effectively scrub NOx. Diesel engines cannot use a 3-way catalyst because they run far too lean, so they require SCR to scrub NOx.
GM was working on prototype lean burn gasoline engines that required a form of SCR to keep NOx levels acceptable. There are links to that project in this forum somewhere....