Yes, I always reset on fill ups. Until last week, when ever I filled up the "miles to go" would be around 650-700, now it's just over 400. I'm going to drop the trailer and run up to town, get some weed trimmer string, then jump on the hiway and run about 30 miles up the road and see what it does. I didn't post earlier, but, it's a 2.7 with 10 speed 4X4.Joe have you reset the mpg indicator? I do mine at fillups usually. I just did mine and went from 19 to 23 in a 40 mile trip. Idling for any length of time will mess up the mpg reading. Towing my 2700 lb dump empty is right around 18.