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      02-13-2020, 01:24 AM   #1
willywi
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Average mpg

Anyone having poor fuel economy with N20 engine? I'm getting 12-13 mpg in NYC traffic and 17-20 in highway in comfort mode I want to know what's the "normal" mpg for 2.0 X3.


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      02-13-2020, 02:17 AM   #2
Opie55
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Although I think the N20 does pretty poorly considering it's size, no way should you be getting 17-20 on the highway if you mean true highway cruising at 70 mph or whatever. You should be doing close to 30 mpg while cruising. As for your city mpg, that sounds low as well, but I have no idea how bad your traffic is. If you are sitting still you will get zero mpg. But the twin-turbo V8 in my 6 series does better than what your are reporting and my N20 does way better.
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      02-13-2020, 08:57 AM   #3
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In Lima Peru (traffic) I do 20-24 km/usgalon which is 12.5-15 mpusgalon.
Highway at 75 mph I do 23 mpusgalon and at 100 mph i do 20 mpg.
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      02-13-2020, 08:58 AM   #4
aspame82
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I forgot to mention is a N20 engine 28i petrol
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      02-13-2020, 09:40 AM   #5
Bruce24
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Quote:
Originally Posted by willywi View Post
Anyone having poor fuel economy with N20 engine? I'm getting 12-13 mpg in NYC traffic and 17-20 in highway in comfort mode I want to know what's the "normal" mpg for 2.0 X3.

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I get around 19-20 MPG if I'm just driving around town and I get 25-26 for all highway. I have about 67K miles on my 2013 X3 xDrive28i.
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      02-13-2020, 10:11 AM   #6
Opie55
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Quote:
Originally Posted by Bruce24 View Post
I get around 19-20 MPG if I'm just driving around town and I get 25-26 for all highway. I have about 67K miles on my 2013 X3 xDrive28i.
If by 25-26 "for all highway" you mean 25-26 average miles for "highway" trips that are not just pure cruising but also getting off the highway for various stops, then that seems about right. When I said 30 mpg, I meant instantaneous mpg while cruising at a steady speed on more or less flat ground.
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      02-13-2020, 11:32 AM   #7
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sounds like I got some super low mpg I already cleaned the valve, changed coil, changed spark plug, air filter, cleaned MAF not sure what else to do to improve mpg. I average about 10.8 mph.
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      02-13-2020, 11:43 AM   #8
Bruce24
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Quote:
Originally Posted by Opie55 View Post
If by 25-26 "for all highway" you mean 25-26 average miles for "highway" trips that are not just pure cruising but also getting off the highway for various stops, then that seems about right. When I said 30 mpg, I meant instantaneous mpg while cruising at a steady speed on more or less flat ground.
I often drive between Boston and NY, a bit more than 200miles at around 75MPH and for that I average 25-26MPG. On these trips, I usually stop once at a rest stop.
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      02-13-2020, 11:46 AM   #9
MichiganMike
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2016 BMW X3 35i  [0.00]
http://www.fuelly.com/car/bmw/x3/2013

See data compiled at link above for 2013 BMW X3 20i. The most common average mpg for 35 similar vehicles in the fuelly database is 23 mpg.
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      02-13-2020, 11:54 AM   #10
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do not forget that, when car calculates MPG is based on UK galloons, US gallon is 3.785 liters and UK gallon is 4.546 liters. if cluster indicated 26mpg shoud be divided by 0.83, which is 21.59 miles per us gallon.
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      02-13-2020, 12:03 PM   #11
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The X3 is my wife's daily driver and she averages 24.5mpg in 40% highway 60% stop-n-go daily driving. We get around the EPA rating of 28mpg on long trips. It is a Sdrive 28i with 73k miles.
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      02-13-2020, 12:57 PM   #12
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Quote:
Originally Posted by aspame82 View Post
do not forget that, when car calculates MPG is based on UK galloons, US gallon is 3.785 liters and UK gallon is 4.546 liters. if cluster indicated 26mpg shoud be divided by 0.83, which is 21.59 miles per us gallon.
I don't think this is true for cars delivered in the U.S.
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      02-13-2020, 02:22 PM   #13
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Quote:
Originally Posted by Bruce24 View Post
I don't think this is true for cars delivered in the U.S.
I don't think so either. I always calculate mine manually anyway, and it's usually within a couple tenths from what the computer shows.
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      02-13-2020, 02:28 PM   #14
aspame82
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Maybe you are right, in Peru It is EU version. But it is easy to verify: change to L/100 kM and compare the values.
I already did it for my bimmer in peru (EU version), I can confirm the mpg are based on imperial gallon (4.5 liters)

Last edited by aspame82; 02-13-2020 at 02:42 PM..
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      02-13-2020, 03:04 PM   #15
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Quote:
Originally Posted by willywi View Post
sounds like I got some super low mpg I already cleaned the valve, changed coil, changed spark plug, air filter, cleaned MAF not sure what else to do to improve mpg. I average about 10.8 mph.
You clearly have something wrong. Whatever it is, the long-term fuel cost of that low mileage is worth getting it looked at even if it costs quite a bit. An X3 is not that exciting that I would keep one if it was getting that mpg. My 2014 X3 averages like 16.5 on a tank that is all around-town errands. But any mostly highway trip is very high 20s. You are seriously getting way worse mileage than my 650 which weighs way more than an X3. In pure stop and go errands on city streets it averages about 14 mpg.
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      02-13-2020, 03:08 PM   #16
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Wait, I just realized that you said you average 10.8 mph, not mpg. That is really slow, and a whole lot of sitting. My in-town errand average is around 19 mph. But again, if your highway mpg is only 17-20, then that is the best indicator something is wrong.
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      02-13-2020, 03:12 PM   #17
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Quote:
Originally Posted by Opie55 View Post
Quote:
Originally Posted by willywi View Post
sounds like I got some super low mpg I already cleaned the valve, changed coil, changed spark plug, air filter, cleaned MAF not sure what else to do to improve mpg. I average about 10.8 mph.
You clearly have something wrong. Whatever it is, the long-term fuel cost of that low mileage is worth getting it looked at even if it costs quite a bit. An X3 is not that exciting that I would keep one if it was getting that mpg. My 2014 X3 averages like 16.5 on a tank that is all around-town errands. But any mostly highway trip is very high 20s. You are seriously getting way worse mileage than my 650 which weighs way more than an X3. In pure stop and go errands on city streets it averages about 14 mpg.
I'm suspecting injector issues, I took a look in cylinder 4 and found much more carbon deposit on the head compare to other 3 cylinder. I might change that injector to see if it helps.
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      02-13-2020, 03:14 PM   #18
willywi
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Here are some picture of the cylinder head. 94K miles
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      02-13-2020, 03:39 PM   #19
willywi
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Quote:
Originally Posted by Opie55 View Post
Wait, I just realized that you said you average 10.8 mph, not mpg. That is really slow, and a whole lot of sitting. My in-town errand average is around 19 mph. But again, if your highway mpg is only 17-20, then that is the best indicator something is wrong.
Forgot to mention highway driving is around 5 miles, 10.8 mph is mix of highway and local speed.
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      02-13-2020, 07:21 PM   #20
willywi
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The commute I had today was 16 miles on trip computer but the fuel reserve shows I used about 32 miles of gas for last trip.
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      02-13-2020, 07:59 PM   #21
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on my wife's 2016 X3 Sdrive28i, she gets around 17mpg on her daily commute (average speed about 20mph). On long highway drives, if we keep speeds below 70mph, we can get about 26 to 27 mpg.
It's basically been this way since new. it's got about 30k miles on it now. Had dealer check it while it was under warranty and they found nothing wrong.

Pretty bad compared to my wagon which has a 3.5l V6 wit more power (302) more torque, is all wheel drive and weighs more. I get similar around town average (17 or so mpg) but highways I easily get around 30mpg on long drives at speeds up to 70mph.
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      02-14-2020, 12:05 AM   #22
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Quote:
Originally Posted by thenew3 View Post
on my wife's 2016 X3 Sdrive28i, she gets around 17mpg on her daily commute (average speed about 20mph). On long highway drives, if we keep speeds below 70mph, we can get about 26 to 27 mpg.
It's basically been this way since new. it's got about 30k miles on it now. Had dealer check it while it was under warranty and they found nothing wrong.

Pretty bad compared to my wagon which has a 3.5l V6 wit more power (302) more torque, is all wheel drive and weighs more. I get similar around town average (17 or so mpg) but highways I easily get around 30mpg on long drives at speeds up to 70mph.
Yeah, to me the poor mileage is really the biggest disappointment with the car. It replaced an XC90 V8 in part to save on gas, and while it is better it is not much better. A 2014 Audi A4 which also has a 2.0 liter turbo 4 will average 26 mpg combined city/highway. Not sure why the N20 is so thirsty.
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