Nosebleed.
Out of curiosity, on your next trip, drive the entire trip but never exceed 50 mph. Then, measure the fuel mileage of your rig when you keep the top speed of your rig to 50 mph or under.
See if by reducing your speed to 50 mph, that you don't end up with fuel mileage in the 15-18 mph range.
Take care
REW
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