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Weight reduction won't do dramatic things but if you find enough of it, and if you do a lot of city start/stop or pulse & glide driving, you'll get some benefit. EPA estimates 1-2% fuel economy benefit for every 100lbs weight reduction. Lighter vehicles will benefit more, as 100bs is a much bigger proportion of a 2200lb Civic than a 5000lb pickup. I took more than 200 lbs out of my Civic. AC went. Power steering went. Back seat and all the liners in the back sections. Front is roughly OEM. Lighter wheel/tire combination than OEM... the list goes on and on. Some of the removals I have regretted slightly, so go slow... the benefits are modest, but they're real.
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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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