[Fat Charlie]

Lots of cars use platinum plugs. It sounds "luxury" and "performance" but it's really "economy." Most of them don't call for replacement until 90 or 100,000 and that's huge savings. I guess the factory sees the benefit in their reputation for reliability, so it's win-win. The ones in your car are probably due, though, and I blame the cheap gas. Messy detonations aren't good for anything involved, much less the only wear item in the chamber.

The first, cheapest and easiest step is to fix or remove the undertray. It's hurting you, so get down there with a drill and some zip ties. Take a look at your air filter. Don't make the same tire mistake this time, and pretty soon you'll be driving exactly what Honda wanted you to drive.