IT TAKES ABOUT 800 HP AND AT LEAST 500 FT LBS OF TORK TO RUN AROUND 80 MPH IN A JET. YOU CAN RUN 90 WITH A STOCK 2.5 MERC., AND CAN RUN THAT ALL DAY. YOU DON'T HAVE TO SLOW DOWN TO LET THE OIL COOL DOWN. BUT NONE OF THAT MATTERS IF YOUR ON THE WATER, THATS ALL THAT COUNTS. HAVE FUN AND BE SAFE.