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Gee it's just not right. I think you need a full professional diagnostic on the car or you might just be replacing stuff that's fine. Bottom line I get better mpg from a 330i so your car CANT be right. MAF known weak area but it's guess work remotely.... Spending money at a good dealer with good diagnostic may be cheaper than the fuel you are using. Driven with some care your car should be capable of 50mpg once warm. It's not like your mileage is 'starship' so would hope cure won't break the bank.
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