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XF 2009 3.0D S. I regularly do the same return journey and the trip computer usually shows about 37 mpg give or take a little bit. If I reset the trip computer, do the same number of journeys, distance, time taken etc., trip computer drops to about 25 mpg. A further reset and it usually reverts to about 37 mpg. Any ideas why this happens? Thank you.
 
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