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Hi, depends on how you drive and also how many miles e car has racked up. Ambient temperature makes a difference and if you use the revs and accelerate hard You will never get anyway near optimum fuel economy. I have a 118 d m sport and it gives about 50 mpg measured on the tank. But my communte normally means aia leave the house and sit at about 65 70 with minimal traffic for about 25 miles. minimal gear changes and hardly any stop start motoring give a reasonable retrun.Also monitor the average speed reading on your dash - the more time you spend crawling through traffic drags fe down so the higher the average speed will mean the better the fe usually (obviously not talking 80-90 on the motorway). You really have to modify your driving to get great fuel economy. If however you buy an economical car like the 1 diesel and drive it normally ou are still getting better fe than if you bought something that didn't claim to be an economical car. The difference in the oem stated figures are down to the fact that manufacturers have to use a predetermined controlled measurement method( usually a rolling road) as its impossible for them to predict the driving conditions, terrain and driving styles of each bmw owner. What this controlled method enables you as a buyer to donis see the differences between each car using a level playing field and make your choice based upon that. You might find also that as the engine and transmission loosen up the fe improves. Also check our tyre pressures are cock on as that hits fe too.
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