I also believe it. My vegas was in the mid to upper 40's with a CVR and the same Y535 prop. (I never had it on GPS, but a guy we run with had GPS in his tunnel hull, at 43 mph and I walked right around him with ease) It just didnt have anymore with that prop, and I hadnt had time to test others. Then lost radio communication and now she is toast Oh well, fun fun fun little boat while it lasted.