Other Fuel System Hoses Lines/piping, And Fittings Problems of Subaru Forester

In July of 2012 while driving on the highway my check engine light came on, canceling my cruise control. I took the car to repair garage I was using and the evap code indicated a leak of . 002. The car was smoke tested and the garage recommended to change gas cap, which I did with generic cap. The again in November of 2012 the check engine light came on again while driving on the highway at 70 mph, again the code was possible evap leak. In Jan 2013 check engine light came on again on the highway, had it smoke tested for 3 hours at the garge, no leak was detected. Changed gas cap again. Then in may 2013 again on the highway, check engine light came on. Again posible evap leak, suggested to get "Subaru" gas cap. Subaru parts personal said the roll over valve on the top of the gas tank was usually the problem most of the time. If the check engine light comes on again, will probably need to replace. So in June after coming off the highway, the check engine comes on. Took car to Subaru and said could not be certain it was roll over valve, however suggested to replace. Code was p0456, which was same code that appeared before in may. If the Subaru forrester has this problem on these models, shouldn't this part be a "maintenance" item to prevent engine troubles? my question for you is how many Subaru forrester's have had this problem? is there a way to ask Subaru for how many Subaru forrester's have had this part replaced on all Subaru forrester's to evaluate if manufacture defect? to change this part, I was charged $418. 14 + tax to fix problem I have no "scheduled" maintenance for . Thank you.

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