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I had the P0420 engine light come on. This was about a year, year and a half ago. Had to do with cats. I was living in Sac Town in CA at the time. Drove it to Charlotte NE in Jan2021. Light only came on twice. I was using Reg(87 Octane). Since I got here, light has come on several times. I decided to try the 93, full tank. The light has not come back yet, but now we have this shortage on. This was Exon gas. If anything, I would say the higher octane and additives are better for my V-6. At least it seems not to clog up the cats, and if they are, clears them out. Not sure what they use but they won't say.
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