Try this site to see if there are any stations in your area with ethanol free gas, that is how I found the one I use, I didn't think there were any in my area until I checked here. There are 5 listed in CA, lets hope one is nearby for you. I see they go as high as a 93 grade as well in CA, that should be enough for a Triumph at closer to sea level. 88 grade, non ethanol, works better than normal 91 grade in my BMW R1100r and gives me about 2 mpg better mileage. My Honda XR650l just feels different running on the same gas. It costs a little more, but the peace of mind alone is worth it for all motorcycles, boats, generators, power equipment etc. where they do not get such regular use and you don't want all that water separation etc. Everything just seems to run and start that little bit better without ethanol mixed in.
The bad running on my Tiger was due to very stale gas IMO, certainly can't claim it to all be an ethanol issue, although that gas does go off very quickly with no stabilizer used. Based on every other internal combustion engine I own, I would still expect it to prefer the non ethanol gas.
I started a new thread with this information too, hopefully it will benefit a few of the forum members - someone other than me must live near one of the gas stations