The milk run system is widely employed on the automotive of industry worldwide. Its usage is derived from an increasing demand of inventory reduction components and finished goods in the whole automotive supply chain. The aim of this paper is to evaluate the benefit perceived by both car manufacturers and suppliers and to analyze the implementation impacts. This evaluation will be based on field research in which the results are based. Another point with great importance nowadays is the energetic efficiency of the milk run in comparison to the conventional routes. As the milk run circuit is not optimized for minimum fuel consumption, we will present, in terms of quantitative calculations for representatives routes, what is the emission penalty of the milk run compared with conventional collect system.