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Have you checked your timing? Done a compression test? What are your spark plugs gapped to?
If the RB20 ECU is anything like the RB25 ECU that's probably your problem. I know my RB25 eats gas like no other. I am only able to get about 200 miles to a full tank in my S14. Also, i was under the impression that in order to use a Z32 ECU you would need some type of tune? I am in the process of installing my AFC-neo and AEM Uego so hopefully i see some better numbers also.
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