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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 10-25-2011, 10:38 AM   #1
Table3
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Question 11 mpg in the city?

I've got an '01 325xi here in Washington, DC. I'm currently getting about 11 mpg in the city, which stikes me as low. All four tires are at about 35psi. I dumped a fuel line cleaner in the tank, but that didn't seem to do anything. I get around 30 mpg on the highway. I welcome any and all suggestions for improving this.
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Old 10-25-2011, 11:02 AM   #2
Kubica
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Prob needs some pre-cat o2 sensors, but 11 mpg is kind of extreme unless you were idling for a long time.
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Old 10-25-2011, 11:02 AM   #3
TR4G-
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I get around 16 (tops) in my daily driving to class at college. It makes sense for me, because its due to the type of driving: very short drives with many stop signs and red lights = shitty MPG. Keep in mind, when you actually use gas to accelerate from a stop you are getting VERY low gas mileage
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Old 10-25-2011, 11:16 AM   #4
Table3
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Originally Posted by Kubica View Post
Prob needs some pre-cat o2 sensors
Can you elaborate a bit on that? I'm afraid I'm not knowledgeable enough to know that means.
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Old 10-25-2011, 12:38 PM   #5
Kubica
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Can you elaborate a bit on that? I'm afraid I'm not knowledgeable enough to know that means.
Replace the two oxygen sensors before the catalytic converters with Bosch units- $45 each shipped from amazon.
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Old 10-25-2011, 12:40 PM   #6
Table3
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Gotcha, thanks. In theory, what effect should that have?
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Old 09-18-2012, 08:05 PM   #7
Les330
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Gotcha, thanks. In theory, what effect should that have?
Did you ever change the o2's. If so, did your mpgs go up?
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Old 09-18-2012, 09:33 PM   #8
NJFF26
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I drive mostly city with a quick 2 exit trip on an interstate and avg 20mpg cant get anymore. I probably would benefit from plugs and o2 sensors but no codes so for now it stays as is.
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Old 09-19-2012, 10:31 AM   #9
325xi1luv
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I have the same issue in my xi I avg 22 over all and now I'm getting 16.9 I
Going to check nitro in the tires and re balance them
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Old 09-19-2012, 11:43 AM   #10
Table3
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Did you ever change the o2's. If so, did your mpgs go up?
No, never got around to it. Still need to look into this.
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Old 09-19-2012, 05:12 PM   #11
tomoyer
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Hey Kubica, the Bosch Pre-Cat O2 Sensors you mentioned from Amazon, are they the Bosch 13477s?
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Old 09-19-2012, 06:13 PM   #12
ixtoxi
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My '02 330Xi gets 24 mpg mixed driving on original O2 sensors and 150k miles.
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Old 09-19-2012, 06:56 PM   #13
Kubica
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Hey Kubica, the Bosch Pre-Cat O2 Sensors you mentioned from Amazon, are they the Bosch 13477s?
Correct.

http://www.amazon.com/Bosch-13477-Ox...ype=automotive

Plugs:

http://www.amazon.com/NGK-BKR6EQUP-M...ds=ngk+bkrequp

Air filter:

http://www.amazon.com/Mann-Filter-25...bmw+air+filter

Oil Filter:
http://www.amazon.com/Mann-Filter-HU...tal-Free+Oil+F

Wipers:
http://www.amazon.com/Bosch-422A-ICO...osch+icon+422a
http://www.amazon.com/Bosch-418A-ICO...osch+icon+418a
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Old 09-19-2012, 07:23 PM   #14
tomoyer
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Thanks for confirming that Kubica. Ordered them as I'm getting the following O2 Sensor codes; E3, E4 CA and CB.

Another question for you, which do you feel is the best thermostat/housing; BMW at $111.95, Behr at $67.95, Wahler at $55.00 or Motorad at $54.68?
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Old 09-20-2012, 03:47 AM   #15
Kubica
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I'm running a wahler with no issues.

I recommend replacing the thermostat every 60k miles.
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Old 09-20-2012, 07:25 AM   #16
325xittt
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I used the link above to check out the O2 sensors. Don't know if this matters but here is a note from the Ad in Amazon for the O2 sensor.

"Note: Bosch partners with other manufacturers to supply the parts your car was originally built with. This product is in a Bosch package, however the part may have been manufactured by an independent Bosch supplier. "

So does this make it a Bosch part or not?
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Old 09-30-2012, 04:57 AM   #17
YOnpds
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Did replacing the o2 sensors fix your problem OP?
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Old 10-03-2012, 11:19 AM   #18
Table3
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Did replacing the o2 sensors fix your problem OP?
Haven't tried yet.

Has anyone else?
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Old 10-03-2012, 12:10 PM   #19
Kubica
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Haven't tried yet.

Has anyone else?
You've been driving for a year like this? Not smart.
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Old 10-05-2012, 12:17 PM   #20
ZemogFC3S
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I had my oil filter housing gasket and ccv replaced a few months ago and my obc mpg went from 17.5 to 21. I drive mostly in the suburbs.
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