There are too many variables to make a blanket statement the X machine uses more or less water than Z machine. My Razor3 has a different nozzle configuration than my
Razor edge, so I can’t even do a side by side comparison.
There is a flow rate chart in the
Washworld manual that shows Gallons per Minute use on high pressure and low pressure functions.
You’d have to get a similar chart for a 4000 and run fake wash cycles based mostly on time. For example:
presoak runs 1 minute at X gpm =
High pressure wash runs 1 Minute at X gpm=
when you get all of the cycles calculated and added together you would have a pretty good estimate on which machine is more efficient.