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I use 5-6 oz of lucas upper cylinder lubricant with almost every fill up. Advance autoparts have them for about $33/gallon and can their online coupons
EPA requires the use of additives to control the formation of engine and fuel supply system deposits in all U.S. gasoline
I've yet to see any independent scientific evidence or testing showing any functional or long-term difference between any brand of gasoline in the US, despite the marketing dollars the "top tier" folks spend.
I typically just make sure to use Chevron and every so often I fill up at Shell. I used to use cleaners, but nowadays I don't feel I need to as long as I don't fill up just anywhere.
I run a can of sea foam through the gas tank after each oil change.
After?? Shouldn't you do this right before you change the oil? But as was mentioned, it's not really necessary on the 350 anyhow as it doesn't suffer from the carbon buildup like the 250 does.