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Average trip mpg fluctuating a lot


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Recently my average mpg readout on the digital dash has been fluctuating a lot.


It's the average one with a crossed out circle symbol, not the instantaneous one.


It used to take a very long time to change as it was averaged over a 600 mike trip, might go up 2mpg on a long trip for example.


But recently it jumped up from 46 to 50 on a 5 mike trip, then down to 24. Now it reads about 21 but it seems to change randomly, and far faster than it should.


No warning lights, 2011 model...any ideas?






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