Last spring got my I/S out of garage early April and found it was near flat with 20 pinholes in tread all over slowly leaking air and after soapy water test, needed to replace ASAP wasn't safe with the Avon cobra on rear with near 10K miles. So, went cheapo route in April 2015 for 125 and bougth Shinko SE Journey for 125 online. So far all of 2015, although only 3K miles tops, is looking good for the price paid. Won't find a cheaper rear tire than 125 new that looks like it should last yet another 9-10K miles much like the Avon Cobra did, or so I hope...
I still have my front Avon Cobra with around 13K miles on it but pretty sure it will last this season, but after 15-16K end of this 2016 season, will be toast am sure needing replacing end of 2016 or early 2017. I'd rather have a slow leak/blowout on rear tire, than the front tire thus not letting it go much past 15-16K tops in front tire. Those that get much more than 12K miles, if that, out of a rear cycle tire must be driving light load, straight line, and easy going, or have very nice, smooth roads to ride on.