I tried lowering my Civic VX a few years back... I didn't find it to help with the mileage at all but it did make the car ride rougher and wore out the rest of the suspension costing me $100's in repairs, you might look in to getting flat rubber belting from a farm store and making a front air dam that hangs lower instead of lowering the whole car.
If you get 14" rims off a Civic HX, early Civic Hybrid or Honda Insight, then you can run the stock, low rolling resistance Honda Insight tires, the Civic Hybrid is the most common of those cars so it's rims are the cheapest and easiest to get.
Some of the CX's came with dealer options like mud flaps, those hurt your mileage too.
Factory block heater screws in to a plug near the dip stick, they are cheap from the dealer but getting that plug out can be a pain.
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