EFI and flowed Nitrous system fuel tuning
5-6% fuel move is a .5 air/fuel ratio point change in high gear:
For example, If you’re trying to lean the engine/ nitrous system down from 12.0:1 to a 12.5:1 Air/Fuel Ratio, then you will need to remove 5-6% of fuel. Put your current fuel pounds per number (PPH) in the calculator link above and put a new fuel pph value in then calculate to see the percentage change. You can also use to calculate how much fuel to add to richen the AFR.