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You'll do better with an ultra gauge, and get MUCH more data from your OBD2 port. This will do some marginal good for people who want it easy, don't care if it is not precise, and are unconcerned if just driving slower will have nearly the same benefit. It's just the optimaization display found in a lot of cars, designed as a retrofit for cars that were not built with it.
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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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