LSF is what we've been running since 2000 if memory serves me correctly... ULSF by law had to be in the pumps by Jan 1 but made it there I'm guessing 60 days early in most places... .
I still see some red dyed fuel pumps with LSF tags, not ULSF and wonder if its really LSF or they just never got around to putting ULSF tags on them... . I've looked to see if where I see the LSF on red dyed pumps, they also have red dyed fuel that is ULSF and have not found it..... so I just assume its really ULSF that hasn't been marked correctly... ...