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My experience with these taller wheels/tires is that I am getting quite a bit better FE than with my smaller ones during steady freeway cruising. At least 5 mpg at speed. My fuel log won't express it because I am using the gain to allow more steady cruising instead of P&G. I just now drove 25 miles freeway and got 61.x mpg without P&G. But there are multiple factors involved. The tires are not the same brand, the aero characteristics are different in a few ways. The wheel is not the same weight to size ratio (is that a thing?). My BMW MINI seven hole 15" wheels are 12lbs while my VX CIVIC 13" wheels were 9.7lbs.
I think without controlling for confounding factors, including weather season and driving habits, we all could relate individual experiences all we want, and still not identify a general rule.
That's what was remarkable about the "Tall Tire Test" thread... th e OP tried to control for or account for the wide variety of variables.
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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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