I ran 3/4 tank of a tank of 110 unleaded at a station in Brainerd (asked the gas station manager to verify it was unleaded first, and he pulled out the pamplet from their supplier).
With the 110 octane and air temps in the late evening I was getting an incredible amount of timing (compared to 93 octane with air temps in the 90'*). Was having traction problems at 30-35 mph. The tires felt like oil on shifts into 2nd gear also. I had good results, but then again I am OBDI and my PCM isn't nearly as aggressive in the TM department as yours.
There is a gas station in Little Falls (about 40 miles closer than Brainerd) that sells 100 octane unleaded. I plan on a tank of that this Sunday since it'* only $.18 more than 92 octane at the same station.