11 mpg in the city?

Table3 · 10-25-2011, 09:38 AM

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, 10:02 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, 10:02 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, 10:16 AM

Quote:

Originally Posted by Kubica

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, 11:38 AM

Quote:

Originally Posted by Table3

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, 11:40 AM

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

Les330 · 09-18-2012, 07:05 PM

Quote:

Originally Posted by Table3

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, 08:33 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, 09:31 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, 10:43 AM

Quote:

Originally Posted by Les330

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, 04:12 PM

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

ixtoxi · 09-19-2012, 05:13 PM

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

Kubica · 09-19-2012, 05:56 PM

Quote:

Originally Posted by tomoyer

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, 06:23 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, 02:47 AM

I'm running a wahler with no issues.

I recommend replacing the thermostat every 60k miles.

325xittt · 09-20-2012, 06:25 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, 03:57 AM

Did replacing the o2 sensors fix your problem OP?

Table3 · 10-03-2012, 10:19 AM

Quote:

Originally Posted by YOnpds

Did replacing the o2 sensors fix your problem OP?

Haven't tried yet.

Has anyone else?

Kubica · 10-03-2012, 11:10 AM

Quote:

Originally Posted by Table3

Haven't tried yet.

Has anyone else?

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

ZemogFC3S · 10-05-2012, 11:17 AM

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.

10-25-2011, 09:38 AM	#1
Table3 Registered User Join Date: Apr 2011 Location: Washington, DC Posts: 142 My Ride: '01 325xi View My Garage	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.

09-20-2012, 06:25 AM	#16
325xittt Registered User Join Date: Apr 2010 Location: Reading, PA Posts: 138 My Ride: 2003, 325 XIT View My Garage	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? __________________

09-30-2012, 03:57 AM	#17
YOnpds Registered User Join Date: Jan 2006 Location: Cali Posts: 447 My Ride: E46 330ci & M3 View My Garage	Did replacing the o2 sensors fix your problem OP? __________________ Makes sense... FOR SALE E46 M3 OEM Diffusers <15k miles My iTrader Feedback FYI's:Kpeng's Maintenance Guide Cooling System Vulnerable E46 areas DIY:Power Steering Lines

10-05-2012, 11:17 AM	#20
ZemogFC3S Registered User Join Date: May 2007 Location: Westminster, CO Posts: 313 My Ride: '02 330xi View My Garage	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. __________________ ~ '02 330xi ~ '89 RX7 TII

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10-25-2011, 10:02 AM	#2
Kubica Registered User Join Date: Apr 2008 Location: Boston Posts: 3,904 My Ride: 2003 325xi View My Garage	Prob needs some pre-cat o2 sensors, but 11 mpg is kind of extreme unless you were idling for a long time.

10-25-2011, 10:02 AM	#3
TR4G- Registered User Join Date: Nov 2010 Location: Baltimore Posts: 873 My Ride: '01 325xi View My Garage	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

10-25-2011, 11:40 AM	#6
Table3 Registered User Join Date: Apr 2011 Location: Washington, DC Posts: 142 My Ride: '01 325xi View My Garage	Gotcha, thanks. In theory, what effect should that have?

09-18-2012, 08:33 PM	#8
NJFF26 Registered User Join Date: Nov 2011 Location: NJ Posts: 167 My Ride: 02 325xi View My Garage	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.

09-19-2012, 09:31 AM	#9
325xi1luv Registered User Join Date: Sep 2012 Location: Fort carson Posts: 5 My Ride: 325xi View My Garage	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

09-19-2012, 04:12 PM	#11
tomoyer Registered User Join Date: Aug 2011 Location: Reading, Pennsylvania Posts: 549 My Ride: 03 325xi, 03 330xi View My Garage	Hey Kubica, the Bosch Pre-Cat O2 Sensors you mentioned from Amazon, are they the Bosch 13477s?

09-19-2012, 05:13 PM	#12
ixtoxi Registered User Join Date: Mar 2006 Location: Park City, Utah Posts: 926 My Ride: 02 330xi, 88 325iX View My Garage	My '02 330Xi gets 24 mpg mixed driving on original O2 sensors and 150k miles.

09-19-2012, 06:23 PM	#14
tomoyer Registered User Join Date: Aug 2011 Location: Reading, Pennsylvania Posts: 549 My Ride: 03 325xi, 03 330xi View My Garage	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?

09-20-2012, 02:47 AM	#15
Kubica Registered User Join Date: Apr 2008 Location: Boston Posts: 3,904 My Ride: 2003 325xi View My Garage	I'm running a wahler with no issues. I recommend replacing the thermostat every 60k miles.