We don't know the mission profile being set, so can't make a comparison. It's clearly not a straight cruise profile - more likely a high speed cruise with some loitering and/or hovering involved. Current offshore aircraft will cruise for over 3 hours with reserves. Even with a fuel burn of 1600 lb/hr you'd have 3 hours and a 15 minute reserve - and that's way above typical fuel burn (nearer 1400 lb/hr)