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My 2015 3500 srw longhorn got 21 mpg at 65mph. Smooth truck

my new 2019 3500 srw gets 13 mpg at 65mph.
Same driving habits. Same transmissions.
Same here.

My 2016 3500 got between 16-20 mpg.

My new 2019 2500 gets 11-13 mpg. Still only 1386 miles on it.

Going to do a 800 miles trip on the 4th of July week (no towing). Let’s see if the MPG gets better.




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I just did a 150 mile trip, mostly 65 mph interstate. 21.6 mpg.
Just finished a 350 miles trip. 14.6 MPG.

2019 2500 4x4 stock. 3.73.

Can’t get better than 15 miles per gallon. I am happy with that.





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It's how you drive it at the start how much fuel you use taking off....to how soon you leave off of the gas and coast up to that traffic light, turn, stop sign, etc...Then what tires and size of tire are you running All Season/AT/MT etc...also how often do you check the air pressure and of course your speed. Now with all of that you have to factor in outside conditions/terrain, how smooth/curvy are the roads you run on etc. There are too many variables when it comes to fuel mileage. Some people get the best mileage with the cruise control and others get better not using the cruise (not sure how that works they must really have a lite foot).

I went from the Factory LT285/60-20 Firestones and to a LT295/60-20 Ridge grapplers (about 1/4" wider and 1/2" taller) and lost about .5 to 1 mpg. I always get better mileage after I have at least 6K miles on the truck and after the first oil change for some reason. I use only......5W-40 Shell Rotella T6 in All of the trucks in my signature past and present. Right now I'm at 15.5 in the city/highway mix and 18.1 on the highway.
 
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I have a 2019 tradesmen 4x4 short bed w/ tonneau cover. I recently drove from Denver to Colorado Springs and back, all highway with some traffic and got 21.5 mpg with speed ranging from 58 to 78. I recently towed my rock crawler set-up (about 9,000lbs) from Denver to Moab over the Rocky Mountains and got 12.5 mpg. In town it's all over the place, with heavy traffic and no mixed driving worst case has been about 12.5 mpg. None of that is hand calculated, I don't care enough to do that.
 
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