I recently completed the Camino from Porto to Santiago. The official distance was 240km. By my calculations unofficially I walked 300km taking into account the non-Camino walking after arriving in a town for sightseeing or looking for a place to have dinner, etc. So, when people ask me what distance I walked on the Camino I say officially 240km and unofficially 300km. In walking the Camino you gain and lose here and there. You made it to the end of your journey. Why question yourself? Don't worry about it.