For what it's worth our stock Ecopia's (not plus versions) ran 14,100 before they were to the wear bar on all 4 tires with rotations at about 4k. I switched to Michelin Energy Savers that ran 33,800. I also swapped our VW Jetta to Ecopia Plus 422 and have 20,000 on them now and look about half way done so I went back to Ecopia Plus for the Leaf last summer and after 11,000 miles I am almost to the wear bars again. I have checked several times and they do say Plus and 422 on them and look identical to the ones on our VW, but they obviously are not.
So this really has done it for me for Bridgestone, marking a tire as a Plus 422 but it is not, fool me once, shame on you, fool me twice shame on me, I am done with Bridgestones for good. I should add I rotate them every 3-4k and we also had Blizzacks snows that lasted 23,500 miles and now Michelin x-ice snows that now have over 10k and look FAR better than the Ecopia's.
Maybe it is just me and my bad luck.
2013 S model with QC package Mar of 2013
lost first bar @ 72k
@100k miles - 57.3Ahr - 87.62SOH - 84.13Hx - 241GID
3.3 kw solar pv - XW6048 - eight L16's
4 ton GSHP - 1 ton ASHP
2003 VW TDI 210k miles - 52 mpg lifetime
EVSE level 2 - Clipper Creek HSC-40