I have used Shell fuel for years without issue.
Fuel from the local Exxon comes from the same refinery as the local Shell station. The differences are the additives used.
One thing to be on the lookout for is general age of said gas station. I don't buy gas from an older facility. Jobbers can mess up and put the wrong fuel in the wrong holding tanks as well. It happens more often than one might think.
Find a station of your choosing and monitor logs periodically to see how the car is doing.
DirtyD's problem isn't fuel. He has too much timing in his tune for the fuel he is using. My recommendations via PM were to reduce timing and richen it up a hair.
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