It is tuned for "premium", not a specific octane, on a technicality.
As for filtration.. KEEP THE HELL AWAY FROM ANY "mom and pop" shop. Habib's this... PJ'S that.. if it isn't backed and OPERATED by a major brand, don't do it. that doesn't mean that any site with the word "exxon" on it is major.. that's just their gas supplier.. stick to major chains.. Speedy Stop, On the Move, etc.
Some of those smaller places I've opened up and seen ZERO FILTERS on the manifold.. NONE.. unfiltered.. as in... all the crap goes to YOUR CAR.
a manifold change takes 2 minutes (shear valve, filter wrench, pull it, reverse), so the only thing that keeps people from changing thenm, or using them at all, is the expense of changing them.
