I have looked at the emigrating Gustafs in Maggies list - not all of them, though, since some of the ones I looked at were a bit time consuming.
I checked the seven who were going to "Amerika" - there was one Gustaf Larsson with a father named Olofsson; he emigrated alone, so would not have reason to be saddled with his father's patronymic. There was another one Gustaf, born 1839-06-12, who emigrated with his family, the father by name Anders Olsson - so he would VERY likely be Gustaf Olsson in America.
The single Gustaf leaving for "USA" had a father with a different name. I don't really think I need to look at the ones who went to Denmark, perhaps those who went to Norway. I have checked one of the guys who went to "Nordamerika", father had a different name. A couple of the others have a family name, which they would surely have kept, another couple have "double patronymics" which seems to be the EmiWeb reflection of the name of the father (and so excludes them).
What I will do is get all the names of the whole family for the son Gustaf with father Anders Olsson.