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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > MPG Observation JBD 100% vs 0%



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      09-02-2013, 09:57 AM   #23
taibanl
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Quote:
Originally Posted by Pierre Louis
How does one correct for proper mile measurement? I used to live in areas where you could do this with special mile markers. Now all we have is GPS, so when you correct for mpg on the hidden computer screen, how does it do it? Does it "fix" the mile reading or does it fix the gallon reading or does it just make a calculation adjustment?

The reason I ask is that if the mile reading is off, so is the manual calculation.

PL
It fixes the consumption fraction
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      09-02-2013, 11:24 AM   #24
Pierre Louis
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It fixes the consumption fraction
So by what you are saying, unless you know that the miles driven is correct, it still may be in error.

PL
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      09-02-2013, 12:52 PM   #25
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Hidden bc menu item 20
How do you get into this?

Is this I-drive only? If so, I don't have I-drive so don't worry about it.
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      09-02-2013, 02:27 PM   #26
taibanl
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Quote:
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Quote:
Originally Posted by taibanl View Post
Hidden bc menu item 20
How do you get into this?

Is this I-drive only? If so, I don't have I-drive so don't worry about it.
Google e90 hidden bc menu
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      09-02-2013, 04:22 PM   #27
zoltans4
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Quote:
Originally Posted by Pierre Louis View Post
How does one correct for proper mile measurement? I used to live in areas where you could do this with special mile markers. Now all we have is GPS, so when you correct for mpg on the hidden computer screen, how does it do it? Does it "fix" the mile reading or does it fix the gallon reading or does it just make a calculation adjustment?

The reason I ask is that if the mile reading is off, so is the manual calculation.

PL
I dont know if anyone has found out the exact way that it gets this info, but it does use injector duty cycle, vacuum, and distance with likely more info.
so if you tell it that it is 2mpg off it will make the correction, likely regardless what the problem was. I would think that the distance in the equation would actually be the easiest fix. It always with 1mpg after it is calibrated in my experience
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