I don't. Unfortunately, there also is no good public source of data on such things as the fuel efficiency of specific tire brands. One thing you might do is check to see if any OEMs use them for their fuel efficient vehicles. But if you find none, that does not prove they are not good fuel economy tires, of course.
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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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