What gas do you put in your classic Mopar?

65Valiant_NC said

I work at a fuel terminal and the more important thing is to buy branded rec gas. Tankers where I work normally load 8800 gallons so if the whole tanker is loaded with branded rec gas it will have close to a gallon of additive in it versus unbranded which might have a pint. People say all the time that gas is gas but not true. There is a formula called "driveability" and places like S****z sell fuel that barely meets the minimum requirement. Always run branded gas whether rec or E10.

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I've heard this before, what kinds of additives are we talking about? What specific effects on an engine do they have? I've always wondered this because I've never been able to notice a difference in how any of my gas-powered devices run with expensive Shell gas vs. the cheapest stuff I can find (around here that would be Valero, Kroger gas stations, Murphy USA etc.). Harmful deposits don't bother me a whole lot because I'm meticulous about maintaining my engines, I tend to carbon-clean stuff fairly often and I drive my vehicles pretty hard at least once each trip I make.