Hey Barnsley. Depends on the mileage. How about a tuneup. air filter, spark plugs, fuel filter. A lot depends on your driving style too, are you gentle on the throttle?
That post with all the links is awesome mate just wish i dropped on it earlier. Must have took a whyle. I have a 318ci with around 40kg removed and it averages 23mpg urban which seems terrible to me as my mates have a old 530 and a m3 and both get more mpg. Any ideas what a 318ci should do?