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It looks like the op has changed mpg to 50, avatar states 350bhp, anyways i think the car might be sold as i saw a trader selling it on auto trader.
I have a mapped 335d and best iv had at 70mph cruise resetting the mpg before leaving for the 120 mile journey was 51mpg. Although if one was to reset whilst driving at 70mph constant, initially you will see approx 60mpg before it starts to drop
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