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If you're serious about fuel economy, it's time to start looking into a JDM CA18DET engine and restoring it to optimal mechanical condition (and perhaps changing over to a similar-sized-to-stock but more modern turbocharger and adjusting the wastegate/reducing boost to 87 octane-friendly capabilities - BONUS POINTS, intercooler delete makes for a bit of an instant warm air intake kit) and getting rid of the KA24DE. It will fight you tooth and nail for eficciency and the CA18DET from the Silvia Q's (or even CA18DE from the Silvia J's if you'd rather not play with turbochargers) is a perfect bolt-up to your current transmission.
Plus, it's JDM tyte. /sarcasm
No, seriously. CA18 if you know what's good for your fuel economy.
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