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R56 gas milege indicator

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Old Dec 22, 2011 | 01:26 PM
  #1  
yyj3869's Avatar
yyj3869
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From: Socal
gas milege indicator

I don't remember It happened since I bought my mini cooper, but every time I noticed that the gas milege on shown indicator is not stable.. anybody has same problem? I don't know what's wrong...
 
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Old Dec 22, 2011 | 02:07 PM
  #2  
Slave to Felines's Avatar
Slave to Felines
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From: Silly-con Valley
There are three readouts for "gas mileage" in the little display in the tach.

One is trip MPG. It takes the number of miles you've driven since it was reset and divides by the number of gallons you've burned since the readout was reset. It will be pretty stable, except for a little while after it has been reset.

Another is the "miles to empty" readout. If I have read the owner's manual correctly, it keeps track of your average MPG from the last 30 miles, and multiplies that by how many gallons it thinks are left in the tank to get the number of miles you can drive before the tank is empty.

The third (and most useful to me!) is the instantaneous MPG readout. That looks at your speed, RPM, and the amount of fuel the injectors are spraying into the engine to figure out the effective MPGs you are getting at this very instant. In theory, if you stayed at the same throttle setting and speed (and on the same up/down slope of road, and the same wind conditions, etc.) you would average that MPG.

The third one will change pretty drastically with throttle position especially. It also maxes out at 99.9 MPG, such as when you're coasting.


...If you are talking about the fuel gauge in the speedo, that's a different story. If it varies much at all you likely have a problem that needs to be fixed, either with the gauge or the sender.
 
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Old Dec 22, 2011 | 02:16 PM
  #3  
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yyj3869
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From: Socal
Originally Posted by Slave to Felines
There are three readouts for "gas mileage" in the little display in the tach.

One is trip MPG. It takes the number of miles you've driven since it was reset and divides by the number of gallons you've burned since the readout was reset. It will be pretty stable, except for a little while after it has been reset.

Another is the "miles to empty" readout. If I have read the owner's manual correctly, it keeps track of your average MPG from the last 30 miles, and multiplies that by how many gallons it thinks are left in the tank to get the number of miles you can drive before the tank is empty.

The third (and most useful to me!) is the instantaneous MPG readout. That looks at your speed, RPM, and the amount of fuel the injectors are spraying into the engine to figure out the effective MPGs you are getting at this very instant. In theory, if you stayed at the same throttle setting and speed (and on the same up/down slope of road, and the same wind conditions, etc.) you would average that MPG.

The third one will change pretty drastically with throttle position especially. It also maxes out at 99.9 MPG, such as when you're coasting.


...If you are talking about the fuel gauge in the speedo, that's a different story. If it varies much at all you likely have a problem that needs to be fixed, either with the gauge or the sender.
I was talking about ur sencond one.. I had 410 miles to empty after I fueled and I drove local about 5 miles to get home and it was changed 380 miles to empty...
 
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Old Dec 22, 2011 | 03:00 PM
  #4  
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Jim Michaels
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From: Blacksburg, VA
The miles to empty estimate varies according to how much fuel you've used most recently. Sometimes that readout will actually go up instead of down, as when you've just come off the track (very high consumption) and are on the highway home.
 
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Old Dec 26, 2011 | 06:24 AM
  #5  
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drsimmons
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From: Robertsdale, Alabama
Mine does the same thing. I believe it's due to the way you are driving. Light on the pedal = more miles, heavy on the pedal = less miles.
 
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