tergos

We drive very defensively as previous vehicles we've owned getting 60k miles at least with fronts always worn more than rears Most of our mileage is on the highway and we use the cruise where possible which spaces us back up to 5 carlengths so no heavy braking except for the odd idiot drivers in the city

2017 AWD Titanium with the 3.5 is the best car we have ever owned but the rear brake life is way less than expected at 23 months on the road. Rear pads worn out and rotors scored. Front rotors are smooth and 10mm is left on the pads. We drive carefully, no stop and go, about 70% highway and the car sees no winter salt. The dealer has no explanation for the difference and of course there is "No Warranty". We are anxious to avoid replacing the rears again so soon again. Could it be off spec or aggressive (semi-metallic?) pads on the rear which wore badly and were the reason for the scoring of the rotors. The front pads and/or rotors were possibly different materials? I have never found my rear brakes wearing out so quickly; usually the front wear out first. The tires are all worn the same with 9/32 tread depth remaining. I have retained the worn rotors and pads in case I need them to find the answer. We have found cases of similar mismatch of front to rear brake life on the internet but no real analysis of what caused it. We would appreciate any help to explain this.