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The Civic Hybrid has 15" wheels I believe and a pretty good aero wheel surface. You need Low Rolling Resistance tires too. The size of the tire can make a difference in addition to the wheel. You might save the cash on the new wheels and look into larger tire sizes that fit your current wheels. Save $$$. Also, the overall diameter of the tire/wheel is inversely proportional to the RPMs rate. The power wheel/tire is basically a gear. You also want to take into account increased rotational mass from a heavier tire/wheel combo. See Sentra_SE's current discussion about switching to larger tires. He is having interesting results.
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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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