This might be a stupid question, but I'm still going to ask it.
As two different fuel types that are mixed together sit for a while, won't they separate? Isn't one heavier than the other, hence the different grade and octane?
Therefore, if you blend your fuel and don't shake it up before running, especially if you don't run you system on a regular basis aren't you going to be burning one part and then another, that could get messy in my mind anyway.
Hey, I was taught to always shake the can of gas/oil mix before I poured it in the chainsaw.
Correct me if I'm wrong here.
Murph'