When I lowered my civic VX I saw no change in gas mileage but I did notice a change in how rough the car rode and notice an increase in suspension bushing wear, but if you already have the parts and you have the time to do the work your self test it for your self, just don't toss the old parts.
As for your tires, your cheapest option might be to get a 2nd set of HX rims, or Honda Insight rims and put your tires of choice on them, removing good tires from rims can damage them, so you might as well use them if you need chunky tread for winter driving or something, otherwise I would say keep the almost new tires and use them till the wear out.
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