re: What is best gas treatment for car?

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burn a couple of tanks of exxon premium

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Using gas with high-quality additive packages is really prevention not cure. In that vain for most people in the South the easy answer is run predominately Shell or Chevron gas only using non-Top Tier fuel when necessary. Doing that with most engines and most duty cycles will prevent ever needing a cure.

There are several decent "cures" available but Seafoam is the one you will see more people swear by and I have had good luck with it in the past. My mom had a car in the late 90's early 00's and because she drove like a grandmother I had to throw some Seafoam in it and drive it at slightly higher than interstate speed for 15 minutes to remove the carbon. It would run fine for another year or so.