Vtec-e automatic engine question...

[metalslug]

So I wanted to get more MPG, I have an AT 93 Civic DX HB with a D16z6 swap in it. When I drive between 45 and 5 MPH I get around 38-40 MPG. But I live 70 miles away so you see I have a need to travel bit faster. I wanted to to do a manual conversion from AT to Mt and slap a JDM D15z1 in my HB. I have the harness, and the fed ECU and EGR box. But I came across a d15z1 AT engine, I did some research and seem like it was released only outside the USA. My question is anyone have any MPG out of this engine and tranny combo? What ECU does it use? Any info would be greatly appreciated. Thanks.