I reckon I saved around 80L today just by using 4 x 1.4mm jets instead of 2 x 2mm jets
Strange really because I thought it might be slightly more due to extra jets...
I honestly thought we would waste more water too, but the fact it just rinses better, wider rinse on glass, more consistent and less pressure at the 1.4mm as you say strangely you just use less water.
I used more water with 2 standard pencil jets on a small brush.