Sorry for rambling...I've been away from the keyboard most of the day.
I'm likely one of the few here on OEM wheels, and the Michelin MXV4 Plus shoes on my ride are okay. I'll never get to feel them in the rain, living in the desert, but they're likely fine. The PO put about 35K on them, and they look to have about 30K left, especially after I do front-end bushings and the rear wheel camber adjustment thingies. $300 is a decent chunk of change, but tires lasting longer offsets it, somewhat.
With the roads being the way they are here in southern Nevada, higher profile tires are your friend. I see a couple of cars a week crawling along parts of some roads because the idiots have put 265/25/22's on their cars.
Morons.
Meanwhile, thanks to kick-ass suspension design and 'normal' tire sizing, I can blow over it at 50 MPH.
Kumho makes a good tire. For the price, they're a
great tire. I had a set of KH11's on the '95 Dodge Intrepid we had, which was equipped with the sport suspension and the 3.5L engine. These tires changed the car's personality to be much more sporty, as they were sticky as all get-out. Granted, they were likely going to last 25K miles, if I was careful, but they were like $65 each...and this was four years ago.
The Tire Rack rocks.
My finger memorized where the traction control button was, as I turned it off a few times per week. People with bona-fide performance cars were surprised how capable it was in corners. Sometimes those tires surprised me with the amount of stick they had.
Those same tires said on them, "For summer use ONLY". I used them in the snow one time in Porland, OR, and I was one of two people who made it into the office that day, was the first one there, and was the sole 2WD vehicle in the area.
Plus, it was cool to have tires which suited the car. The stupid stop lights on freeway entrance ramps were good for smoky acceleration from a stop, which you don't see from large, FWD, American sedans.
This said, I'll probably put Kumho's on the 420 when the time comes...probably OEM size, as I dig the chrome OEM wheels on there now, and they'll likely be the Solus KH16.
Beware if you're shooting for long tread life by aiming at high treadwear numbers. If you have corners on your daily drive, a tire with a treadwear rating of 500 or more might leave you with tread in the center while the edges are down-to-cord bald. This happened to me in the CO mountains with Michelin X-Ones. I shoulda known better, but it was 100 freakin' miles per day. Fun tires would have bankrupted me. Hated those X-Ones from week one....