Tires GT Radial or OEM Porsche

I drive my 981.2 (718) Cayman in the winter around here in Ohio and it does fine with winter tires (does better than most AWD things with just all-seasons)

I have had great luck with GT Radial so far.

Currently running GTRadial Chamiro UHP1 tires and am about to install my 2nd set. They are CHEAP and almost as good at the Direzza Star Specs on my Porsche. I was shocked I got 20k miles out of them, they grip really well and don't get greasy easily at the track.

I have heard good things about GT Radials... I use "Road Hugger GT Eco" (aka Kumho something or other) and they have been great. Low noise, (relatively) good grip for being low rolling resistance.

I bought a set of GT radial Champiro with the expectation that it will be just a crap daily driver set. They actually have really good grip for non race tires. Seriously, so much so that when I put the front set on and went to autocross, it caused my car to spin out because the front had more grip than the rear.

Tires are 235 40 18 GT Radial Champiro UHP1 Ultra-high performance summer tire ^ VERY sticky tire w/stiff side wall (nice handling and picks up lots of little pebbles - but I would not trust this tire below 40 degrees)

I run a set of GT Radial WinterPro HP. 245/45/17 all around. Very cost friendly set of tires @ <$100/ea.

I had a great winter season last year, even in the midst of our huge snowstorms and freezing weather.

The socal 86 cup is sponsored by them, so they've all I've ever used. They're more like 260tw. But I got 245 r40 17 for like $80 each. They're not the best, but they're the best for the money.

Friend has a set, they are pretty good for how cheap they are, but they won't be as fast as most of the other 200 tw tires.

I know GT radial tires are on the cheaper side. My GF got them last summer, in may. I checked them today and they are down to about 4/32mm. She basically drove 8 months with them, or 25k km, almost exclusively highway. Is that expected? I'm used to tires going for 50k km.