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Mine has lost some MPG too. When it was nice out I was getting around 450+ miles to a tank, now it's down to around 400.
Do you let your car run to warm up? Warm up time can decrease your MPG as the car is using gas, but not gaining mileage.
Also, cold air intakes are kind of a waste. A good, drop in filter like a K&N, Dinan, Pipercross etc... will do the job.
Most "cold air intakes" aren't even cold air. It's a pipe and a filter that sits right in the engine bay, in fact sucking in HOT air.
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Current Bimmer
2004 X5 4.4i Sterling Grey Sport/Premium
Past Bimmers
1991 318I Alpine White
1995 740I Alpine White
1991 525I Schwartz
1998 323IS Scwartz
2004 330CI Cabrio Titanium Silver Metallic
1995 540I Schwartz
2000 Z4 3.0 Titanium Silver
2000 330ci Coupe Titanium Silver
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