My 2011 GMC did run noticeably better after I did a few 1100 mile trips putting in a can of Techron at the beginning of each trip. But then it could have just blown out some cobwebs as before that it rarely saw highway driving.
I did find a local gas station close to my new home in TN that for the first time since I owned the truck it behaved poorly until I filled it up from a reputable station. The place very much looked like a place that wouldn't have good gas, my guess is water in their tanks.
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