I am also Norwegian and I also dislike tipping culture, but when they have your daily ice tea ready for you before you come in I would say it would be strange t

I am also Norwegian and I also dislike tipping culture, but when they have your daily ice tea ready for you before you come in I would say it would be strange to not say "ah, just keep the change" now and then to show that you appreciate (and essentially pay for) the extra service.