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I have a '15 SXT FWD, well maintained DJ that I have not had any issues in the last 3 years. I usually average 16.7 to 17.3 MPG / AVG on the dash monitor, since I do almost no freeway driving. On long trips I average 24 to 25 mpg, which is pretty satisfactory to me. Over the weekend I got in the car and noticed the display showing 12.9 AVG, which was very surprising to me. I drove about 3+/- miles and it went up to 15.4 AVG. I thought it was just a fluke and by the end of the day I ended up at 16.5 AVG. This morning I got back in and the display showed 12.9 AVG again. I drove to work (about 4 miles), and it ended up at 16.3 AVG. Car sat all day, and at the end of my day (about 8 hours) when I got in to go home, again the display showed 12.9 AVG. I looked around for anything similar on the forum and web, but do not see anything like this. Also not sure why the magical number of 12.9. Anyone experience this before? Anyone know as to why this could be happening, or how to solve it? I'll be filling it up later today and will reset it at that point. I have not used any other gas station other than I normally do (Chevron 89). We have had a pretty big drop in our local temp, but not anything outside of the usual normal yearly drop. Seems like a system type of issue more than anything. No issues with starting the car or noticeable drop in the charging system (battery). Thoughts?