I believe i am running the Vtec D16y8 with the Z6 Ecu . over theD15B i am getting very poor fuel economy . est City .. 22MPG - Recently Got a new battery 52Ah . Change Engine oil ,. Flushed . with Mo2 Addictive Clean the IACV - City - 20 MPG Highway - 32 MPG compare to what i heard about this swap i am getting so much Less. what should i be looking for without losing Power. Thanks in Advance .