Yes, I think it is credible too. One can easily find graphs of speed/FE relationship online to suggest further corroboration. Too, we know the drag force magnitude increases faster than velocity until it becomes a major factor in determining a car's top speed. I'm using laypeople lingo for it, but you get the principle.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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