I had mine for more than a decade, and had a lifetime fuel economy somewhere around 70mpg of mixed driving. I had virtually zero maintenance from 160k to 250k miles. In the last two years I pulled the stock drivetrain out and put a hot Honda 2.4L in, giving it a 0-60 of around 4 seconds and 45mpg mixed driving, with 55-65mpg possible on the highway with a light foot. I'd get another, but they're extremely rare here.
Your observation with your Explorer is certainly puzzling. I wonder if there might be another factor at play.
I wonder if it might not have something to do with the shape? For example, ships are long enough and have enough drag that they have certain speeds where they have much lower fuel usage, and others where its much higher, due to the way fluid wavelengths interact with the hull.
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