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I've been reading about D15z1 and correct me if I'm wrong from what I understand the main factor for the better fuel economy from this motor is primarily from the VTEC-E head and its valve operation, more precise fuel injection from its wideband 02 sensor, EGR system and ECU Lean Burn Mode. IMO keeping it DPFI would be more of the dumb version of lean burn. I dont expect to match the MPG of full OE Spec D15Z1 conversion but hopefuly I will gain some from the original D15B2 motor. Wishful thinking perhaps?
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