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The display number is relative. As a value. Mines off 11% at 60-mph. A glance tells me how I’m doing after correction. The main value is in checking against current road conditions. As a tank for me is in excess of 700-miles, the display rarely is left alone.
As to mpg:
A fuel stop 50-60 miles out from home. Warmup (including tires) is done. Fill to first auto shutoff. Then, a drive of 100 or more miles. Make the midway turnaround at a deserted crossover to avoid stopping.
Run about 62-64/mph. Keeps you under commercial traffic, but not so they jam up behind you. 100% cruise control use. No lane changes. Cancel cruise to get groups around you (drift down to 55; use terrain to re-engage cruise: let the computer handle the drivetrain). No accel or decel. Note exceptions.
Back to same pump and refill same way.
A baseline which anyone can copy. This is the most important consideration.
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