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If you're thinking it's low, then when was it last serviced. Have you put any BMW fuel system cleaner through recently. What fuel do you buy, supermarket/branded etc. Are your tyre pressures correct. Do you use air con a lot. Upt'North.

Sounds great to me but then my 4.6 V8 averages 18 mpg but if I try I can easily get it into single figures 😈😈

Morning Paul/ Check www.realoem.com for both models put the last 7 digits of your vin in to the search box it will bring up your model do the same with the donor. Look in the gearbox section and click on the part number it should give a list of other models the box was used in. Just had a quick search and and it looks as though the 6 speed transmission was an option, check it out and check the 6 speed part numbers against your model. Dave