Quote:
Originally Posted by cRiPpLe_rOoStEr
Real-world driving is way different than the standardized certification tests, to the extent that a shifting point other than what EPA requires may eventually lead to a much better efficiency overall. And a more efficient engine burning less fuel due to better shifting may also feature a decrease to the emissions.
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Yes, real world driving is different than standard certification test. That is why after the diesel emission scandal (involving more manufacturers than just VW) regulators around the world are adding on-road emissions tests in addition to dyno tests.
Fuel economy and emissions are often at odds. VW's approach to emissions cheating was specifically focused on improving fuel economy at the expense of NOx emissions.