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I get a fairly consistent 240 miles from a tank, so that's around 20mpg, mostly in London traffic. Out of town I can get 400 miles per tank, with 40mpg on motorway runs at either 50mph or 80, seems to work out the same!
DriverLDN - the B58 engine in the 340/440i is a big leap forward, though you might see those petrol gains go up in smoke if you have any sort of heavy right foot! The start-stop is nice though, especially in London, wish my N53 had that!
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