Own a 2015 Forester XT stock . Vehicle has suffered a lingering fuel management problem . Post history :dealer replaced transmission due to a stubborn leak (covered by ext war.)replaced lower arm due to shuddering , no cost . Shuddering persist this time check eng , hill ascent lites on and s mode lite flashes . Soln. replaced 4 spark plugs and retuning & updates . After 3 mos symptoms came back except for shuddering brought it back ,after diagnosis cause of problem O2 sensor replaced at no cost . I enjoy driving my Subie as a daily workhorse . Performance wise it has its glory’s . But at these cost .