xanderd

Hi 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?