40mpg on a run is not "real-world" 40! Mid-to high 30s is far more likely as a long-term average for mixed driving. I mean how many people actually achieve the combined figure on newer cars without driving like a granny! Are you tryng to mislead us?
If I had meant mixed driving then I would have stated mixed driving. I was very clear in what I said and I stand by it. It is capable of more than 40mpg, and in a second post which you've also outlined I explained the circumstances in which it would do it. The only misleading going on here is with you, desperately trying to imply I said it does 40mpg round town or something daft.
I once drove the 525i from Southampton to Plymouth - a route containing mostly A roads and only 6 miles of Motorway. It returned an astonishing 38mpg. My 530i, itself hardly thirsty on Motorway trips, only does about 31ish on that route. The N53 is a remarkably fuel efficient engine. Get it on a long Motorway trip and you'll be amazed. Don't take the usual misguided line of 'Oh, its a big engine, it can't be efficient'. It is. It's been specifically designed to be and sadly thats the reason why its so unreliable.
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