Soave, or Arrrj what is the fuel capacity of the 66
it's 279 liters useful
I think you could fly at least 2 1/2 hours with 3/4 tank at 70% torque (that will fly you at 105-110 knots)
At 72% torque I was burning 1,38 lts per minute last time I checked.
I think comparing a Long ranger to a R66 it is a bit unfair, of course a Long Ranger is better.
But it just makes no sense operating a LR for sightseeing at my point of view.
R66 is the right choice for this one. But if we were talking corporate flying or anything similar I'll go with the LR for sure!! I operate in many confined areas and tight spots and the LR could lack of power depending on your weight, the R66 will do the job!
Cheers!