I got 61 gps on mine with between 1/2 and 3/4 tank of gas and flat water.
The speedo said 65mph on that run, and with very light fuel I have seen 68mph on the speedo. I should see 63-64 GPS with light fuel. Boat is 100% stock and I am at sea-level and in salt water.
I can't imagine running WOT @ 60mph in my boat in 4 footers. I hit a cruiser wake the other day which was a good 4 feet and I remember watching the beer in front of the passenger come out of the cup holder and levitate for a while...and then we landed. For as much air as we got the boat did land really well--I don't remember it hurting anyways!