Well I am using cheap diesel from unknown source in cans for A6 and on the run it does 38-40mpg maybe more, locally 33-34 but it is manual unlike A8 , weight I believe is about the same. I would have expected a bit more mpg on 2.5TDI A8 maybe EGR or wastegate is sticking, I do feel like one of them is sticking on mine sometimes, I will do overhaul and most likely blank off EGR and delete function from ECU but I am leaving it for now until cambelt change, it is now at 154k miles and first change was done at 86k so looking to do change @160-170k
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20th August 2011, 07:46 PM
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