I don't think the comparisons of top speed or 0-60/quarter mile times says anything relevant here. For those types of runs, the engine rpm is running through max torque and HP levels where pulled timing would undoubtedly make a difference. We ski at a steady mid RPM (much lower than either max torque or HP). I'm not ruling out that there might be a difference, but I believe it would be subtle at best.
That said, here at Okeeheelee tournaments, we purchase the recommended fuel for the boats used on our tournaments. I have been chief driver for all but one tournament this year (and handled the fuel ordering for the other one) and have specified premium for the Nautique and Mid-Grade for the other boats as recommended by the manufacturers.