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i had a passat syncro 2.8 V6....same set up as the Audi quttro........it was auto (which made it worse) but it never got over 20mpg...EVER. and was slow.
I've got a A6 2.8 Quattro and am reliably averaging 29mpg (according to the Driver Information System), 50 miles a day to work and back - a good run, a bit of stop start but no motorways.