The PH article is about the percentage of ethonol (biofuel in petrol) low sulfur is a different issue, the biofuel issue is pretty serious, I have a 1979 MG Midget and have for some time had a serious problem with the carburetors which a complete rebuild did not cure.
A neighbor who has classic motorbikes gave me an article from Classic bike about the problems of biofuel and that amal carburetors do not like it, the company that manufactures spares for amal and su carbs have produced specila floats and needles that are designed to cope with the problem. I have fitted these to my SUs and so far no problems. The same article however raised a number of other issues mainly concerning the corrosive nature of petrol containing biofuel and this is causing numerous problems with steel petrol tanks.
Note this is all about petrol that is currently sold with up to 5% ethonol, we are soon going to be supplied with fuel containing 10 and 15% ethonol, this is going to cause some serious problems mainly for owners of classic vehicles but it is also likely that more modern cars are going to be seriously affected by this move.
Sorry bit of a rant.