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Best mpg will be at 60-mph or below. The trucks hit a wall at that speed or higher.
For a highway trip under 300-miles, average speed will be close to speedometer set speed if at 60. Faster one goes, the greater the discrepancy between average (actual) and speedo set speed. No lane changes, no braking, no off throttle to deal with traffic, etc.
This is so up to 62-mph. After that one is mixing with commercial traffic
High mpg is long term discipline. Several hundred thousand miles. The diesel fuel advantage takes just about 200k miles to achieve (over gasser equivalent) in a pickup.
15 is what I average with a 35' travel trailer. It's lousy for a solo truck.
And the engine is a 6.7. Only 6.9 was a 1980s Ford with a Cornbinder oil burner.
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