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Beautiful! We've owned 8 CRXs (including a convertible) and have an '84 just like yours.
If you want to bump mileage, I wouldn't spend a lot of effort on aero stuff, but try to recreate an HF. Our '87 HF was rated at 57mpg. I stuck Honda motorcycle carbs on a replacement SI engine (peppy as all getout) and still got 45mpg, and sometimes over 50. Our other SIs get 45-50mpg, so 60mpg is achievable with no radical changes. There is a guy over by me that does nothing but restore CRX HFs and resells them for big money. To maximize mileage, you should find the HF trans as it was geared really high. They also had very light aluminum wheels- I could kick myself for letting mine go. The rear brake drums were very light aluminum but are very hard to find. A set of headers would be desirable, but they're very rare, too. You will always have issues with that little 3 barrel and the CVCC head. I'm a Welding Engineer (I see you're into welding & fab) & mechanic and wasted many, many hours on our '84s original carb. I got a freshly rebuilt carb and it didn't idle any better than the one removed. I swapped a Weber carb like so many others and it helped but it still doesn't idle perfect. Now if you're really after high mileage, fuel injection would be the way to go.
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