navman47**
New Member
- Oct 12, 2025
- 2
- 0
- Truck Year
- 2020
I'm curious as to anyone with a explanation for this question. I've experience this issue with both my 2016 EcoDiesel and my current 2020 Limited. I live in Texas and have
traveled much of the midwest, southeast and the southwest as well as the mountain states of Colorado, Wyoming, New Mexico, Arizona and Nevada. My typical fuel economy on the highway is between 24 to 26 mpg depending on the highway speed limits. Point being no matter where I drive I am consist. When I travel in the mountain states at higher altitudes my mileage gets much better. Both my trucks had a rear ratio of 3.92 final drive. Both have improved mileages in the mountain states. My best calculated mpg for my 2016 was a tad over 28 mpg. I just recently measured my mileages from Santa Rosa, NM to Durango, CO, to Flagstaff, AZ, Phoenix, AZ and my last fill up in Socorro,NM with all those calculated at 27.5 or better. I'm guessing the improved mileage in the higher elevation has to do with the reduced air resistance. Anyone have a more technological reason for the improved fuel economy? One would think the mountain driving would require more power and fuel.
traveled much of the midwest, southeast and the southwest as well as the mountain states of Colorado, Wyoming, New Mexico, Arizona and Nevada. My typical fuel economy on the highway is between 24 to 26 mpg depending on the highway speed limits. Point being no matter where I drive I am consist. When I travel in the mountain states at higher altitudes my mileage gets much better. Both my trucks had a rear ratio of 3.92 final drive. Both have improved mileages in the mountain states. My best calculated mpg for my 2016 was a tad over 28 mpg. I just recently measured my mileages from Santa Rosa, NM to Durango, CO, to Flagstaff, AZ, Phoenix, AZ and my last fill up in Socorro,NM with all those calculated at 27.5 or better. I'm guessing the improved mileage in the higher elevation has to do with the reduced air resistance. Anyone have a more technological reason for the improved fuel economy? One would think the mountain driving would require more power and fuel.