I regularly get 18-20 HWY MPG ,My best 22. 5 65-75 MPH, Mixed City 14-16, I am Very,Very Happy with my 13s. 3211 on the OD 1/3+ Tank DEF, it looks like this truck is going to reach 5K on factory DEF fill and NO active regens.

I don't blow smoke up anyone rear, and I only state facts as truths.
Drive smart and the mileage will good to great.