My dealer said to NOT go by the TPS on the bike but to get a GOOD pro model tire gauge & us it. The TPS is mainly to let you know you have a tire problem not to check the true pressure. The day I talked to him they had 3 GTLs in the shop & checked all 3 rear tires with their gauge then rode the bike to see what the TPS showed. All 3 bikes with 42psi by the gauge showed 3 different psi by the TPS. 1 was 43 , 1 41 & 1 39 psi.I was religiously running both tires at the recommended 42PSI on the bike's TPM. (Typically showed 44PSI on my gauge, when the bike showed 42PSI)
I got about 6000 miles from my Z8's & ordered a set of PR3's today. I hope to get better mileage from them. I'm use to 10K rear & 18K front from my LT.The PR3s are much better wearing then the Bridgestones. I have 5000 miles on them so far and have not had a problem with them. Almost all the time on the PR3s were with the bike loaded since they were installed in the middle of a road trip.