Ram towing mileage

I just towed a 2022 Cadillac CT5 on a UHaul Auto trailer from Toronto to New Brunswick, Canada. Truck is a 2014 Ram Longhorn 4x4 with a 5.7 in it. I was hoofing along at a pretty good pace even through the mountains of Maine. My average was 13.1 MPG. (US Gallons). My normal mileage is about 18 MPG, (US Gallons). I drive with a pretty heavy right foot most of the time.

Jack