the ll stands for low lead standard fuel you can buy at any airport is 100ll but dont try to take your sled in there to buy it bring gas cans atleast here in wa they wont alow you to put in in anything but a plane or a gas can
I'm going to play with Shain's Boost Juice this year. I plan on running 100ll and 1-3oz/gallon to see if I can go over 12-14 #'s. From my questioning it has many lubricants and I also believe some lead.