In the beginning I used 10 gals. water to 5 gals. concentrate with great results.
The only issues I had were some customers complaining it was to much foam and took to much time to rinse off. Which I didn't mind to much.
Also had a few customers complain that the red foam tinted their car (which we buffed out easily).
I now use 15 gals. water to 5 gals. concentrate and have had no complaints.
I have also found the need to dilute some KR products more than 2/1 in order to get good rinsing. 2.5/1 has worked for me where the Ultra lean tips would not work. If ultra lean tips work, then Olive seems to fit the bill.
I have done it both ways, as long as your tips don't plug your fine. I think kleen-rite [simoniz] is too hard too rinse from my experience. I prefer JBS products because of color and scent and rinsing ability. I have run a calibration test on right out of the bucket vs pre-diluted and you can come up with the same dilution ratio either way. CCAR