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      10-01-2012, 03:06 PM   #1
Adobong_M
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My M3 has different mpg reading

It used to be exactly the same but the past couple of weeks I noticed that the mpg on the cluster display calculates differently from the mpg displayed on the nav. screen. Any idea what's going on? I took a pic of the cluster showing 17.8mpg and the display on the nav showed 18.5mpg.
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      10-01-2012, 03:09 PM   #2
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ill take a clearer pic next time and the mpg on the nav split sceen was cut off by the "next exit display" But you guys know what I mean.
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      10-01-2012, 11:23 PM   #3
mark896
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I asked the exact same question on this board about 5 or 6 months ago and got no reply. I have no idea.
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      10-01-2012, 11:24 PM   #4
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Reset the system and see what happens?
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      10-01-2012, 11:32 PM   #5
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You can reset them, but they start to drift from each other at some point.
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      10-02-2012, 12:14 AM   #6
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Thanks! At least I'm not the only one having the same issue. But how do I reset the cluster? LOL
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      10-02-2012, 06:50 AM   #7
doubleo
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hmm I dunno... maybe the NAV one is your MPG on that particular trip?
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      10-02-2012, 02:43 PM   #8
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Quote:
Originally Posted by DiegoM View Post
Thanks! At least I'm not the only one having the same issue. But how do I reset the cluster? LOL
Just hold down the button on the stalk when your fuel mileage is being displayed.
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      10-02-2012, 06:47 PM   #9
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There are two readings that you can alter. One for trip A to B (or whenever you reset your readings) and the other is overall MPG (which you can also reset to match your first reading if you reset them at the same time).
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      10-02-2012, 09:30 PM   #10
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why would you take a photo at 70mph? :/
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      10-02-2012, 09:32 PM   #11
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Quote:
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why would you take a photo at 70mph? :/
why do people take photos at 160mph?
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      10-03-2012, 12:43 AM   #12
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maybe the T-boys can chime in?
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      10-03-2012, 12:52 AM   #13
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Is one lifetime mpg and the other your normal per tank mpg?
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      10-03-2012, 07:36 AM   #14
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Quote:
Originally Posted by ILSMKU
Is one lifetime mpg and the other your normal per tank mpg?
Even if it is, it doesn't matter--the point is that they drift. They have to be calculated at different places on the car, only thing I can think of.
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