When I 1st bought this ram 8 months ago, I was averaging between 16.7 and 18.2 MPG, which was as expected. I had this expectation because I owned a 2014 hemi ram with the VVT motor before that for 150k miles and averaged the same mpg. For some reason at some point 4 months ago late Sept/early Oct my fuel mileage dropped to between 13.8 and 15.3 and has stayed there since. I have noticed the eco mode not turning on as often as it should. The ram has about 20k miles on it at this point. The dealership is telling me it's because it is cold out and using auto start, but the problem started when it was still between the 60 and 70 degree temp range. I have noticed when the truck itself is cold it will not go into eco mode at all. My 14 Ram didn't act this way Thoughts???