I always mix a dixie cup (or two) full of my 110 Sunoco leaded in a couple gallons of the water they sell at the local Chevron. Then use this same mix when blending a gallon of 90/10 for the two-stroke engines. I never have a problem any longer with the small motors choking and mowing the lawn now smells like running my Cobra. It's not enough to carbon the motors but it does take the edge off the ethanol. Ingenuity is the father of invention, or in my case, a little chemistry experiment never hurt anyone.
-Dean
P.S. I also add Sta-Bil to all stored fuels. This stuff works quite well.