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First thing to do is get it back to the dealer and have them bled. You probably have some air in the system. I have a 2021 Laramie Sport and the brakes are fantastic!
Please post what you find out about the problem.
Yes, mine is Four Wheel Drive. My speed varied from 40 to 65 for the first 400 miles and then 50 to 75 the last 400 miles. I tried to vary the speed up and down as well as duration to help the break-in.
I drove my new 2021 home from the dealer 4 weeks ago. 800 mile trip and I averaged 23mpg. I have the 5.7 with E-Torque and 3:21 final drive. I am averaging about 18mpg around town. The 23mpg was the same as my 3500 with the Cummins I traded in. A pleasant surprise for sure. My highway mileage...