Why would short-haul flights be pressurised at a higher cabin pressure? In the article here : https://abcnews.go.com/Health/Healthday/story?id=4507808&amp;page=1 it is claimed that


  Short-haul flights are usually pressurized at 5,000 to 6,000 feet while long-haul flights are closer to 8,000 feet, according to Thibeault, [M.D., medical advisor, IATA].


But why would this be? My understanding is that the cabin pressure is chosen as a balance of:


what the aircraft can withstand without slow structural deformations, so that it is functional for many years
what is most comfortable for the passengers
most fuel efficient- pumping in air requires some fuel.


With regards to comfort, I should think that low pressures take their toll after a few hours (I think I read 3-9 hours, for people developing altitude sickness symptoms at about 8500ft equivalent cabin pressure).

The only guesses I have at why short-haul flights can operate at higher cabin pressure is:


the aircraft body won't have as much structural change with a short-term pressure difference
the plane can 'retain in' air pressure without actively pumping it for some time on the order of hours/ half-hours, so it is not so energetically costly.
For the structural loading, the absolute cabin pressure is not as important as the pressure differential with respect to the outside pressure.

Short-haul flights typically operate at lower altitudes; either because they are operated by turboprop aircraft which have a lower service ceiling, or because there is simply not enough distance to climb to a high altitude and glide back to land. At lower altitudes, the outside air pressure is higher, and thus the cabin pressure can be higher without exceeding the maximum pressure differential the fuselage can handle.

Your other concerns are not really a factor. Only the pressurisation cycle count really matters to aluminium, not the total pressurised time duration. The fuel required for pressurising the aircraft is also not really a factor compared to the energy required to either heat or cool the air for passenger comfort.