i am using l12a ecu with L15A2 . current city average goes to 15km/l. adjusted my tunning with honda HIM. although throttle body is not perfect. my l15A2 EGR is closed by a tikkli. old l12 wiring.
in 1000rs petrol without a/c in goes to 200km sometimes.
the main thing i swapped whole l15a2 i.e injectors, tb etc