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Hi

I used the trip computer for the first time during a long journey, the result was 45mpg that I was impressed with (300 mile of mostly motorway in green with a short burst of sport).

However on the instrument cluster behind the steering wheel it's reading 35mpg. Why is this figure different?

Cheers
Ash
 

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Don't rely on the figures form the computer.
I was told by the service department that on my R55 they can adjust the readout by + or - 10%.
I always brim up and have a phone app which does the calculations.
 

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To reset, press and hold the button on the end of the indicator stalk.

You have a trip computer, for the current trip and a long term on board computer, this is why you get differing readings.

The one behind the steering wheel is the on board (long term) reading.
 

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somewhere on this site there was a posting informing of a unpublished back door to enable adjustment of MPG calibration. Holding left stalk down for 10+secs....or something like that to activate ? I cannot find this posting.....can anyone help ?
 
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