I assume you have eg civic engine d15 carb. Is your engine running on optimum temp? Thermostat installed? Auto fans? Then adjust the carb and set ign timing to factory specs it should give you 10-11km/l. If you want to go for efi than get complete engine D15B vtec with its wiring, but for efi you have to make other changes also hence not advised until engine is busted completely.
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