You cannot use fast travel in hardcoe mode?
Yes you can, but the time that passes in game while you are fast traveling counts towards your hunger/thirst/sleep meter. That's what they were saying, and this is why I will fast travel to a location half-way to the location I want to go to so I can make sure all of that stuff is in check.
no, that's not what he said. If you fast travel your dehydrtion meter will drop due to the time elapsed in your trip. if you have no water and your dehydration meter is low you will not be able to fast travel to far away place.
Sawyer said that, yes, you can fast travel in hardcoe Mode.
However, the game WILL NOT LET YOU fast travel if it calculates that the time spent on the journey would kill you by depleting your meters. So if you try to fast travel with low meters, the game will basically say "No. Fast traveling will kill you right now. Go find food and try again."