Do you plan on maxing out aero-mods or have you considered lean burn? Running lean was the real keystone to my success. Btw, I made it as high as #4 on the % over list
I laid out my plan pretty clearly in my worklog and I believe I had some references to what I thought the theoretical limit for mpg was for the ZX2 if you were to do no eoc.
I've recently purchased tuning software and hope to spend some time this winter learning it so I can go for a 60+ tank next summer.