Tom:
I do use the equivalent "Tru Fuel" 50-1 Mix for my leaf blower and weed eater. Only about 2 gallons per year so the cost versus the very good benefits is minimal. I really like the fuel as it keeps me out of the repair shops for the "cheaper" engines for carb repairs. I considered using the the 100% Gas "Tru Fuel" for my Cub GT 2000 (20 HP Kohler)but the purchase of 30 gallons per year was (for me) cost prohibitive. I can't remember the cost of the fuel but it was very expensive in the 5 gal and 30 gal drums. Fortunately for me, I can still purchase 100% gasoline at 2 stores nearby, they sell 93 octane at about $.80 per gallon premium over ethanol. Living near the coast with all of the boats and other watercraft allows the station to sell quite a bit of the 100% gasoline, so I am getting, pretty much, fresh fuel each time I make a purchase. I think the makers of the "SEF" and "Tru Fuel" could sell a lot more of their product if they adjusted the price somewhat on the 100% Gas side of their product. I do understand their increased cost based on packaging and shipping but their price is to steep for me. How is the 100 LL AV Gas working out for you? I considered going that route but after doing some research, I found that some small engines like it and others just don't do well on it becasue of the lead build up. Something about the low compression small engines (not being able to disburse the lead buildup out of the cylinder) versus the high compression aircraft engine. I have read a few threads on this tractor site where some use the 100 LL AV gas with good results. I just hate to take a chance with an engine that costs $1,800.00 to replace.
Good Luck