Islander 270 purchased new in March 2002 with single 250HP OX66. Put 465 hrs on it by Nov 2005, then repowered with twin F150's.
The OX66 was strong, thirsty, reliable, loud, thirsty (yes).... Cruise at 4000RPM was about 22-24kts, getting about 1.2-1.3nmpg. WOT RPM was 5400-5500, at approx...