Ok I have a quart of Fa that i bought from NAPA a couple of weeks ago so it does exsist.
I also have a quart of Type F that i bought from Autozone last night so that still exsists and is currently be sold.
As far as the difference/similarity goes....i have no Idea still.
But I will use the Type F for my E50 cause that's what the manual says. Of course it also tells me not to use Unleaded which baffles me.