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Originally Posted by Dayze
so what was/is the deal with the VW Diesels? were they misrepresenting MPG?
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From what little I've read they had a program that switched fuel mapping while testing then switched to more responsive fuel mapping for every day use.
It's kind of strange to me that people are reporting lower fuel mileage after reprogramming so that it runs on the measurement mode. I would think with the lower emissions it would be the opposite.
Edit: had a conversation with our groups mechanical engineer and he said it has a lot more to do with exhaust gas recirculating than fuel mapping. So it then makes sense that it would hurt fuel mileage.