My 2014 A22 came with an ACME 537 (13.5 X 16), which got damaged by my error when I first got the boat. I found another 537 at a dealer near the lake. Then when I had enough engine hours to fill the bags and drop the wedge, I found that with 6 in the boat and a surfer I had trouble getting the boat to 11.2 mph. If it did get there it was wide open and lugging and could not hold speed. At that time I discovered that I screwed up when I bought the replacement prop that was just as incorrect as the original.
When I took the prop to the propeller facility near my home, Wilmington Propeller Service
http://www.wilmingtonpropeller.com (they even do tug boat propellers), I explained how I needed less pitch. We talked about how the boat behaved, showed the videos of wakesurfing (they went crazy for it as they were all old surfers), and they said they would take 2" of pitch out when they unfolded the blade tips. A coule of days later I picked up my "new" 13.5 X 14 propeller. I love this prop. It matches up pretty well to the ACME 1579. Fully ballasted (I think the front is 900 and the rears are 750s) this thing runs rings around my original. Great at wakeboard speed, and for waterskiing (no wedge and no ballast) it is a dream at 28. I rarely ever go faster than 30 - 35 and therefore cannot tell you the top speed at redline. I just really like it as a general purpose wake and ski prop. I cant give an answer on exact GPH, but I use a lot less gas when surfing all day with this prop compared to the original. Also I think the machinery will last a lot longer with the lower torque loading.