Hi mind sharing what car you are using ?

Replaced these tires early part of 2015 ran them about 25000km and two of them are almost bald while the other two are still acceptaBle .
These tires do help save fuel by having low rolling resistance but my god do they wear quick .
But their performance is very good especially few months back during a downpour on the motorway . I emergency braked and these tires stopped in a dime. Like the moment I floored the brakes I was almost stopped immediately from 80+ km/h bear in mind this was wet weather quite amazed by this so wanted to share. During this maneuver the thread was about 50% worn evenly
Now though with the rear at 20% it's aquaplaning when hitting slight puddles at 80.
But the dry grip is still great. Went up and down venting fully confident .

i rotate every 10k km or every service if you would. i think due to the fact that i installed anti roll bar on the front suspension mounts this reduces the car flexing and therefore preserved the front tires very well i must say. the way i drive the tires still seem healthy with deep threads whereas the rear i did not install and therefore it wore very drastically. previous tires before these i did not install anti roll bar they wore evenly. i asked my mechanic if there was problem with my rear camber or suspension he said no. so yeah.. i would recommend installing anti roll bar.