Al, is E85 not an option for you? I know availability is an issue in some areas, especially on the street as not many stations have it at the pump.
From what I've seen, I personally wouldn't attempt to run a big blower w/o either running E85 or straight alcohol.
Just seems like a fuel change would be easier...but if it isn't readily available, then I completely understand. That's why mine is still on gas. E85 was easy to get here for a lil while about 8 years ago or so, but not now.