Originally Posted By: WhizkidTN
I've pretty much gone that route as well. I use Costco's 93 octane in the turbo Optima and 87 octane in the Rogue. My semiannual fuel clean is Redline SI-1. Just bought the PEA rich (or so they claim) new Gumout to try in the Rogue before a big trip.
I do it a couple times a year, as well, maybe an extra one or two if I come across a big Regane sale, but those haven't been terribly common lately. Here, pricing is the same pretty much all over, so I can't exactly find a "cheap" premium and then worry about maintenance doses of SI-1. All the Top Tier stuff is the same price as the stuff that isn't, so there's no reason why I shouldn't use it.