Search and rescue is almost soley helicopter traffic, and very rarely requires leaded fuel (a turbine doesn't need leaded, it can run on it, but it'll run just fine on unleaded too). The number of places still using non-turbine helicopters for anything other than training and very light sightseeing is very small, probably close to 0% worldwide.

Same is true of Medical Transport except possibly for Australia where light aircraft are used more frequently than turbine helicopters.

Same for powerline inspection, although there could be a couple of companies using Robinsons somewhere I guess.