It is all about the additive pack.
I read a test a while back that exxon has the most in regular octane in parts per million, of detergents. Shell in Premium has the most, period.
For my car, i normally would get Exxon as it was around the corner and the cheapest in town, new town now, and that exxon is no longer an Exxon. It is an Ex-Exxon.
The only fuel i stay away from is stuff like WaWa or *insert generic name here* fuels, like U.S. Petroleum or Patriot Fuels, etc. It's just i am a guy who likes to know what additive pack is going into my fuel, and if i shop at known brands i will at least know what is going in there.
Realisticaly, the Citgo station probably has a crappy underground storage tank that hasn't been pumped out in years. You live in NY so you get E10, ethanol is a great water dispersal agent, causing it to mix in with the gasoline at pumpout time. Also it may have more than 10% Ethanol in the fuel, that could cause errors as the engine is running too lean or too rich from the increased alcohol content. I don't go to Citgo personally, it is more of a 'i don't support the government that owns it' situation. I know a lot of the oil and stuff comes from overseas. but at least the final stop is a company not owned by Venezuela.
When was the last time you changed your fuel filter? I'd venture a guess that it is kinda nasty. Dump some Heet in there, run it through, and then replace the filter.