Industry insider - if your figures are correct then 3.6 hours minus 30 mins IFR reserve equal 3.2 hours - multiply by 145 kts and you get 464 miles or a RoA of 232 nm without any time on scene unless your time on scene was the 30 mins but then you don't have any reserve.
232 RoA doesn't beat the Sea King - more poetic licence???
Pasptoo - what is the range speed that gives that fuel burn?