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American diesels don't get the fuel efficiencies of European models due to emissions controls. When you run a diesel engine at peak fuel efficiency, you run it hot and lean. This produces lots of nitrogen oxides in the exhaust. To neutralize the nitrogen oxides, the car makers enrich the fuel mix and shift the timing, or rebreathe the exhaust through an EGR, or inject diesel directly into the catalytic converter like the new Powerstrokes. All these measures deliberately waste fuel and produces soot in order to mitigate nitrogen oxides, and reduces MPG by up to 20%. I heard about this and wonder if there is an online guide to "convert" it back to European mpg? I would buy in...That's due to the world's toughest diesel emissions standards. Pushed by California, then imposed by the EPA. It's gotten so ridiculous, Mercedes and Audi have introduced engines with a secondary urea (piss) tank which they use in a catalytic converter to chemically react and neutralize more emissions.CA, NY, NJ and I think MA are phasing out perfectly good running diesel school buses and buying expensive new ones with Tier-3 diesel emissions compliant engines. On bankrupt state budgets.Welcome to runaway eco-fascist regulatory nightmare.