2013 Hyundai Sonata MPG went down after replacing Battery and Plugs

Maintenance/Repairs
3

I agree with that computer reset theory. Since the reset , it has very little input from which to average.

You should see the MTE on my Expedition !
Using the input from around town, it will spit out numbers based on that when . . . I fill up completely for a day trip to Albuquerque . . set out on I-40 for the 140 mile ( one way ) trip . . As I look at the MTE . . and look at the mile posts. . I can clearly see the evidence of its averaging calculations.

    • 480 mte… . mile post 26 . . mile post 27 . . mile post 28 . . 479 mte !
      And so on for MOST of the trip ! Even on the return trip , it seems that I can still drive at least 1-1/2 TO 2 miles before the mte subtracts just one.
      It has so many city miles in its history that it really has no clue when I set out on the rare hiway trip.

It took a road trip to Disneyland last year for it to catch up with itself.