Yes, the MPG Illusion.
Duke Professors Jack Soll and Richard Larrick discovered this a while back - that mpg works in terms of diminishing returns such that gains made on fuel thirstier vehicles save more fuel.
In truth, and they articulated this in the video, mpg is a poor measurement of FE, for the simple fact that it isn't linear.
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EcoDriving: Turning more fuel into usable forward motion.
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