Thread: Low Gas Mileage
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Old 01-05-2013, 11:20 AM
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mlukas161 mlukas161 is online now
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Location: WNY
 
Join Date: Oct 2008
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Mein Auto: 03 330i, 04 X3
Quote:
Originally Posted by AzNMpower32 View Post
That sounds right for urban driving, and unless you're resetting your Board Computer on the hwy drives, your average is going to get dragged down by the amount of urban driving you do. I'm surprised by the O2 sensoe comments; of course these could be the culprit, but I haven't touched them @ 145k mls (224.300km) and don't plan to unless there is a drastic degradation in drivabilty or consumption.
Don't take my word for it. :-) the manual recommends replacement at 100,000 miles. For 65 bucks a piece and an hour of time I would at least change the 2 pre cat sensors. I changed mine around 130,000 in our 2004 x3. We average 20 mpg around town and saw 26-27 mpg on our last family road trip. It pays for itself in my opinion.

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