Sonata I45 (YF - 2011+) :: Average MPG Fluctuating A Lot?


Feb 13, 2013

I purchased a recertified 2011 Sonata GLS with 15k miles about a month ago. It has treated me well so far but today it started doing something really weird. I refilled the tank about 60 miles ago and reset the average MPG gauge when doing so. I was averaging 28 MPGs and it was fluctuating no more than .2 MPG when accelerating, going up hills etc. With 60 miles on the gauge, the average should be relatively steady and has been. Until tonight... On the way home from work my average MPG suddenly dropped down to about 18 or so, and was fluctuating up to about 25 MPG on flat roads. Whenever I would accelerate even a little it would drop way down to around 18 within a matter of seconds, and come back up to 25 in the same amount of time. It was acting more like the instantaneous MPG gauge...

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