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      07-30-2010, 08:44 AM   #51
cdeslandes
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Drives: 2010 Z4 s35i
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Quote:
Originally Posted by tranquility View Post
I think you know what I mean, but just to be clear: does the car's fuel consumption improve once it is broken-in and months/years later on in its engine life?
That is usually the case, for most cars.

One thing I've learned about these direct-injected, high strung engines is that they are very sensitive to a dirty air filter.

On my IS350 I noticed a fuel mileage degradation once the air filter reached 8,000 miles/13,000 km or so, and changing it instantly restored the mpg.
I would assume the N54 engine to be just as sensitive; these things need lots of air! Change or clean your air filter every 10k miles/16k km or so to preserve your fuel mileage and performance.
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