yes, i measured twice and the front said it was more that the rear. i can only guess it is because of the bearings.
Looks like overall Pilot pure front is .018 heaver compared to 80% used tire.
Rear is .726 lighter compared to 80% used tire.
I'd say they are 1lb lighter per set.
I've got ti rotor bolts in the mail and will post their weight savings once changed. last time I did them it was 5oz total.