I love my 13" Michelin Defenders. I cannot say how much they benefit FE. There are just too many factors in play. But there are studies out there. Search this site and you should be able to find links to some of them.
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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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