23.21 MPG from a 2017 Ram/Cummins. 65-mph highway baseline test, Sept. 5, 2017
222.7 miles, 9.593 gallons
65-mph freeway/highway test
Tires: F 60 R 40 cold
Regular cab, long bed, 7,400-lb. GVW
Newer diesel trucks are not as efficient (due to emissions systems) as previous generations? Maybe. Probably. Though it depends on the exact year, model, and version. The true potential is better than some think, and the conditions, load, and nearly everything else matters.
Tests must be repeatable and confirmable. The ECM was slightly pessimistic here, and the odometer a little fast with the stock tires.
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