The Honda Insight has 14" rims and the stock insight tires will be about the right size for the CRX but they are an odd size that are hard to find, very few choices to choose from, stock insight tires of course will give you a boost in mileage by being low rolling resistance light weight tires.
155/80 R13 tires would be better, your crx is light enough that it can handle narrower tires, but for the gear ratio... I would say to do a transmission swap, $150 and a day of work and you will have a better gear ratio.
What trim level of CRX do you have?
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