So I have a Z1 in my 99 EJ8, recently got it tuned after I got it through a trade and the gas mileage is HORRIBLE. I am barely getting 100 Miles to the TANK! IS this normal? Took it back to my shop and the tuner connected it to KPRO and the A/F ratio was perfect. I am running on the stock injectors as well as the stock fuel pump, could this be the reason? Any other DD swapped K drivers please put your input on how your MPG or how much you get to the tank. Thanks for the help.