The worst thing the EPA ever did was restrict the high milage baby diesels.

My wife has a 2023 Ram 1500 4WD with the 3.0 v6 diesel. Worst mileage we have seen since new was when we pulled our 14 foot enclosed trailer to Mississippi and back. Only got 17 MPG on that run. Usually get about 25 MPG around town, and I have seen up to 32 MPG highway.