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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 04-06-2012, 12:40 AM   #1
mfischer267
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Gas mileage help

Hello all, I have a 99 328i and I am a little bit concerned. I am getting 400 kilometers on a full tank (60 litres (100 bucks of premium)). I know that these machines aren't no Honda civic on gas, but I feel like this is a little TOO bad. Anyone else with a car similar to my own getting similar mileage? Is this mileage completely normal???
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Old 04-06-2012, 12:43 AM   #2
TekNoire7
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I mean it is dependent on the way you drive, where you drive, and how well the engine is running. I had my vanos redone back in february and it significantly increased my mileage.
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Old 04-06-2012, 01:00 AM   #3
mfischer267
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Sorry I forgot to mention the kind of driving I do. I live in a fairly small town but do quite a few short trips, not much highway.
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Old 04-06-2012, 11:52 AM   #4
eweis
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So, what does that translate into for MPGs?
Based on my observations, I would say that the average that people around here get is about 24 mpg. I would guess the standard deviation to be about 3 which means that 2/3rds of people get between 21 and 27. There is a left tail skew to this however, as you're more likely to see someone with a problem leading to poor mileage in the mid-teems range as opposed to someone miraculously getting mid-30's mpg.
For myself, I get about 26 because I drive pretty conservatively and keep my car well-maintained. Just changed my O2 sensors which seemed to help a little.

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Old 04-07-2012, 10:41 AM   #5
fraser19
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Quote:
Originally Posted by mfischer267 View Post
Hello all, I have a 99 328i and I am a little bit concerned. I am getting 400 kilometers on a full tank (60 litres (100 bucks of premium)). I know that these machines aren't no Honda civic on gas, but I feel like this is a little TOO bad. Anyone else with a car similar to my own getting similar mileage? Is this mileage completely normal???
I am in Alberta so our climates and settings will be closer.

In the city I get 500-550 per tank. 20-25 mpg is normal.
on the highway I have got 720 then the fuel light came on. 32 mpg is normal at 70 mph.

Buy your self a ScanGauge 2 and calibrate it to your car.
This will help you with codes and it gets you better gas mileage as you can see the difference a few millimetres on the gas will do for you.
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Old 04-07-2012, 11:15 AM   #6
TxZHP04
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The OP is getting roughly 15.7 mpg which is really low even with no highway driving (I do better than that even with the SC'er and a lead foot). Without knowing the condition of the car it's hard to know where to begin. You may have a vacuum leak somewhere. Sometimes this can be found by visual inspection of intake boots, etc and other times you need to invest in a smoke test. Some other relatively cheap and easy things to try would be to replace the air filter, fuel filter, and spark plugs if they haven't been serviced recently. Might also be worth adding a good fuel system treatment at your next fill. Beyond that, it's possible that it may be time for some new O2 sensors and/or a new MAF sensor. Bottom line, you need to run some diagnostics to see what's going on - replacing sensors that don't need to be replaced can get expesnive.
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Old 04-07-2012, 03:37 PM   #7
mfischer267
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I went onto a website that could calculate my mpg. I put in the numbers (400 km) and (60 litres) at ($100 full) and the mpg was 18.6. That is Canadian. This would translate to 17.x in American. I think it is inevitable that something is wrong. I'm a fairly conservative driver so I should be getting better than this. I will definitely look into everything you guys mentioned. Thanks a lot
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Old 04-11-2012, 06:17 PM   #8
Roggy
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400km on 60 liters comes out at 25.2 miles per US Gallon approx.

Sorry, should not have jumped in while looking at something else.
You are correct within the limits of metric conversion factors. I mixed a couple up.
Having recently bought a 2004 330, I was shocked at the numbers. I seem to average close to 30 on US gallon, over a mix of 75/80 mph highway & suburban driving.

Last edited by Roggy; 04-11-2012 at 07:23 PM. Reason: Error in original post.
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Old 04-11-2012, 06:29 PM   #9
TekNoire7
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My calculations came out to 16.7 mpg ... 400 / 1.61 = 248.44 Miles

60 liters, 4 liters in a gallon. 60/ 4 = 15.

Therefore 248.44 / 15 = 16.6 mpg.

Someone correct me if I am wrong.
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Old 04-11-2012, 06:53 PM   #10
TxZHP04
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Quote:
Originally Posted by TekNoire7 View Post
My calculations came out to 16.7 mpg ... 400 / 1.61 = 248.44 Miles

60 liters, 4 liters in a gallon. 60/ 4 = 15.

Therefore 248.44 / 15 = 16.6 mpg.

Someone correct me if I am wrong.
Close... but your conversion from liters to gallons is slightly off.

1 km = 0.621 mi, therefore 400 km = 248.4 mi
1 L = 0.264 gal, therefore 60 L = 15.8 gal

248.4 mi/15.8 gal = 15.7 mpg

Don't know where some of the rest of you guys studied math....
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Old 04-11-2012, 07:01 PM   #11
TxZHP04
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Quote:
Originally Posted by mfischer267 View Post
I went onto a website that could calculate my mpg. I put in the numbers (400 km) and (60 litres) at ($100 full) and the mpg was 18.6. That is Canadian. This would translate to 17.x in American.
Liters, gallons, kilometers, and miles are standard units of measure and don't vary between the US and Canada. The value of a "dollar" is different between US and Canadian currencies but the price of gas is irrelevant to fuel consumption calculations. 60 L per 400 km equates to 15.7 mpg.
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Old 04-11-2012, 07:14 PM   #12
TekNoire7
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Originally Posted by TxZHP04 View Post
Close... but your conversion from liters to gallons is slightly off.

1 km = 0.621 mi, therefore 400 km = 248.4 mi
1 L = 0.264 gal, therefore 60 L = 15.8 gal

248.4 mi/15.8 gal = 15.7 mpg

Don't know where some of the rest of you guys studied math....
Not bad, did the math from while working out at the gym. The decimal points in this problem made a huge difference. I just used the elementary conversion of 4 liters in a gallon lol. Do not understand how anyone got anything higher however....
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