Here are a couple mods you can do that will improve fuel economy: complete upper grill block, partial lower grill block, lawn-edging air dam, raise tire pressure, remove power steering, injector kill switch. Then hypermile moderately and these cars will probably top 50mpg for you without overmuch work. All of these mods and more, as well as fairly heavy and very dedicated hypermiling have been my mainstay for over 4 years now... in a car almost identical to yours.
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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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