In this paper, we develop a dynamic multi-sector energy economic model that takes into account the difference in the automobile industry, the production cost, and the fuel consumption due to vehicle types or engine types. In the previous research, an economic model is developed considering the inter-industry linkage of the electric power sector and the material industry. The novelty of this paper is the point that newly considered the automobile industry. This paper evaluates the impact on the economy and energy supply and demand due to the structural changes in automobile industry such as spread of next-generation vehicle (NGV) in an integrated viewpoint from the economics and the engineering. Simulated results show both positive and negative effect of structural changes on industries and implies that the spread of NGV, the appearance of car sharing service and the charge and discharge of electric vehicle to power grid do not always have a positive effect in the society as a whole. This research enables further and more comprehensive analysis of the automobile industry.