A great highball for Fernet fans - the sweetness of the cola (and the high 3:1 cola - spirit ratio) work well with the bracingly bitter alpine notes of the Fernet. Just add a little more Coke if the highball has too much Fernet for your taste.
I tried this with a no sugar-version and honestly it doesn't work. I don't know if it's my proportions or the Fernet bitterness acting with the sweetener but the bitterness shines right through. The flavours are nice though, it's just the sweetener with Fernet combo that doesn't work.