Welcome to Ecomodder's.
If you put a HF transmission in I would expect you will see a 5-10% in your mileage.
SVOboy has a 1st gen CRX that he switched from a automatic to a manual about a year and a half ago. He was able to get his mileage up into the 40's. He got a used VX engine, from Japan and an non-California VX controller and converted it over to that about 6 weeks ago. He got about 60 mpg on a trip to Detroit.
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