My recommendation is get Kevin @ Dunn Tuned to tune it. haha
My Dad was an petrol engineer for Exxon. While yes, most of the petroleum comes from the same place, the refining process and additives each gas producer adds are much different.
Most tuners prefer Exxon/Mobil, BP and QT gas. A lot of people having tuning problems were using Shell gas.
I learned a lot of this because when I went to tune my old Cobra at Gearheads I had filled up with Shell and it was pinging really bad. Luckily there wasn't a ton of fuel in there. We drained it and I filled up with QT and there was no problems.
Ford even recommended BP gas for years. I think they still do.
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