Unlikely with doing it for the duration of getting gas, but even if it does, it should clear itself within a couple of drive cycles once the computer is satisfied the issue is resolved.

Those look more like iridium or platinum plugs. They’re probably rated for 100k miles.

he premium will not have ethanol in either which is a good thing.

Yeah, I wouldn’t count on this. Unless you’re at a rare gas station that has ethanol-free gas, the premium still has ethanol in it everywhere I’ve seen. If you do find one that has ethanol-free fuel, it’s usually $1.00-1.50 more/gallon than competing stations with E10.