Swift fuel ATSM approval
The fuel didn't get ASTM approval. The D 7719 ASTM specification got approval to go from a testing specification to a production specification.
Having said that, I just checked the type certificate for the Victa and it states "Fuel: 80/87 minimum grade aviation fuel." and nowhere does it nominate which standard that fuel must conform to.
Seems no reason it can't use 100SF or G100UL now. They are both aviation fuels and both have octanes greater than 80/87. If I was stupid enough to ask CASA they would say no, but might be better to seek forgiveness than ask permission.