I disagree with that theory if the gas is bought at Sheetz. Sheetz is watered down. I seen it destroy fuel injection systems on automobiles cause how much water is in the gas. But if gas bought from a Exxon or Shell then its probably poor storage practices.
Bull$hit. Been in Central PA since 1993 and have used Sheetz for gas since then. I'd say I've got probably well over 400k in various cars with Sheetz gas. Never an issue with the fuel systems in any of them. From a carb'ed 1986 Mustang to a 2010 Taurus SHO.