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I tow my 2.6t caravan with a 2015 150 TDI, and the annual service is carried out in December. I now have 30000 on the clock.
On identical journeys from Sydney to Melbourne in Jan 2016 and Jan 2017 I have measured 10% increase in fuel consumption (15.2 to 16.7). On the rest of my trip (2000km) I also see similar increases, but not on the same roads so a direct comparison is not possible.
It could be a changed driving style, or wind direction, but the trip is on dual carriageway and therefore less likely to be lead-foot syndrome.
Does anyone know if the dealers are updating engine software at a service, without telling, or am I being too suspicious?( I'm thinking of the emissions issue). Has anyone else noticed such an increase?
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