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I left my average mpg trip untouched for several thousand miles and if it is to be believed then on average I get 38mpg. That's a UK gallon and there are 1.2 US gallons in a UK gallon. A mix of town and motorway driving and I never bother flicking to ecopro. It is diesel of course and I would say 95% of the current 6 series cars over here in the UK are diesel.
BMW claim an average 54mpg for the 640d which I can't even achieve even using the lightest of touch. How they achieve this figure will be based on the same sort of test software nonsense that has landed VW in the doodaa. It's about time the test and inspection processes caught onto this. But hey, 38mpg is good enough for me
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