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The tires are a suspect. How well inflated do you keep them (measure with a hand-held gauge, not the gas station air pumps)? And what tires did you buy? Were the new tires LRR rated? LRR = "low rolling resistance." Check out the specs on tirerack.com
And I agree 40mpg in that car is pretty good. Is it an auto or manual transmission?
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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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