For my driving style, TC definately helps lower tire wear.
In the beginning, with fresh tires, you'll notice no difference.
But when tires are 50-75% used, THAT is where you gain the time from driving with TC.
I was in lap 4, halfway the track, then my tires got REALLY bad... every corner red rear wheels, even with 25% throttle.. horrible. Because I was losing grip , it got much much worse much much faster. Lost like 60 seconds that last lap.
I also tried with TC on. Again, halfway lap 4 I noticed the tires were gone but then I still had to drive the last 3 minutes. This time th TC managed to keep the rears from spinning too bad, kept the car under control to make the pits. Lost 20-30 seconds that last lap.
Also: if you're driving you 3rd 4 hour stint... you're gonna be glad you turned TC on.
You'll be tired (BORED in my case) and concentration is gone. If you forget to easy on the throttle you'll burn the rear tires and voila, lap is gone or worse: you have to pit early.