You have already identified the easiest way to improve your mileage. Get a fuel economy gauge and drive slower. Just driving 55 mph can improve your economy 20% or more. You already have one of the best engines for a pickup truck. If you want to do something for aero move your tool boxes inward and have them inward of the truck cab.
A few years ago a friend and myself drove out to New Jersey from Iowa in an older Dodge Diesel, it had a 5 speed and a standard topper.
We had to make the trip in a weekend and drove it 75 mph most of the time. It averaged about 20mpg. I was impressed.
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“The further a society drifts from the truth, the more it will hate those that speak it.” George Orwell
“Before a standing army can rule, the people must be disarmed; as they are in almost every kingdom in Europe.
The supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed.”
– Noah Webster, 1787
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