Odometer: 51.6 MPG
MID: 45.3 MPG
Fill up but using almost assuredly correct MID distance: 50.3 MPG
The Odometer overregisters by 3% compared to the MID, but I'm guessing my fuel parameter is wrong (I don't honestly know the injector size for my injectors).
Either way, I'm happy with 50 MPG, I broke the barrier on my first try!
So multiply your current fuel parameter by 45.3/50.3. That will decrease the fuel consumed by 11%. Then check your next tank vs the MID and do a final tweak.
Realize that when you EOC, your VSS signal is gone while you wait for the engine to die before you turn the ignition back on. So during that short period of time, the MID will not capture distance. Your distance is prolly more than what the MID says. In my case, I estimate 1 mile per day. The more EOC's the more error. It is small enough to ignore though.
I am thinking of going 8valve too, would i have to do any other mods for it to work?
My only advice would be to get a D16Y8 head gasket - metal > fiber
Also, I HIGHLY recommend getting both your engine and block surfaces checked out by a machine shop. Most people are willing to do the head but not the block. I just know from one of MY experiences that I pulled the head, had .002 removed, fresh headgasket, new ARP studs, put it all back together, and still blew the headgasket due to an uneven block surface. This becomes especially crucial for D-series engines that have that stupid fiber head gasket. When you pull the head off the motor, more than likely you'll have that thing stuck to your engine block, and machining it off is the best way to get it perfectly flat.