Hi,I need to replace rear drivers tyre and was wondering if running a 225/45/17 91W would be ok with the other 3 being 225/45/17 94W?Only reason is I've been offered one with nearly full tread fitted for £25. The one on at the mo is nearly legal limit, other 3 are nearly full treadDoes anyone know the mimimum spec recommended by subaru?TaMike