Correct you are zlilk...increasing your fuel grade past recommended makes no difference what so ever. Save your dimes & nickels people and stick to what the manual recommends.
Here's another little tid bit of information- avoid gassing up when a fuel delivery truck is in the process of re-stocking tanks. It's the same line of thought as burning your VX tank down to near empty. You're getting sludge. In the case of your local "Exxon/Shell/BP 24hr Megaplex" the new fuel being pumped into the holding tanks is kicking up the crap settled down in the bottom. That little pearl came from a friendly local petro engineer despite the fact that the delivery guy will tell you otherwise.
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Extreme Q Vaporizer