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-   -   11 mpg in the city? (http://forum.e46fanatics.com/showthread.php?t=882075)

Table3 10-25-2011 10:38 AM

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.

Kubica 10-25-2011 11:02 AM

Prob needs some pre-cat o2 sensors, but 11 mpg is kind of extreme unless you were idling for a long time.

TR4G- 10-25-2011 11:02 AM

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

Table3 10-25-2011 11:16 AM

Quote:

Originally Posted by Kubica (Post 13734292)
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.

Kubica 10-25-2011 12:38 PM

Quote:

Originally Posted by Table3 (Post 13734344)
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.

Table3 10-25-2011 12:40 PM

Gotcha, thanks. In theory, what effect should that have?

Les330 09-18-2012 08:05 PM

Quote:

Originally Posted by Table3 (Post 13734614)
Gotcha, thanks. In theory, what effect should that have?

Did you ever change the o2's. If so, did your mpgs go up?

NJFF26 09-18-2012 09:33 PM

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.

325xi1luv 09-19-2012 10:31 AM

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

Table3 09-19-2012 11:43 AM

Quote:

Originally Posted by Les330 (Post 14742786)
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.

tomoyer 09-19-2012 05:12 PM

Hey Kubica, the Bosch Pre-Cat O2 Sensors you mentioned from Amazon, are they the Bosch 13477s?

ixtoxi 09-19-2012 06:13 PM

My '02 330Xi gets 24 mpg mixed driving on original O2 sensors and 150k miles.

Kubica 09-19-2012 06:56 PM

Quote:

Originally Posted by tomoyer (Post 14745487)
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

tomoyer 09-19-2012 07:23 PM

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?

Kubica 09-20-2012 03:47 AM

I'm running a wahler with no issues.

I recommend replacing the thermostat every 60k miles.

325xittt 09-20-2012 07:25 AM

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?

YOnpds 09-30-2012 04:57 AM

Did replacing the o2 sensors fix your problem OP?

Table3 10-03-2012 11:19 AM

Quote:

Originally Posted by YOnpds (Post 14774420)
Did replacing the o2 sensors fix your problem OP?

Haven't tried yet.

Has anyone else?

Kubica 10-03-2012 12:10 PM

Quote:

Originally Posted by Table3 (Post 14783730)
Haven't tried yet.

Has anyone else?

You've been driving for a year like this? Not smart.

ZemogFC3S 10-05-2012 12:17 PM

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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