In the development of Battery Electric Vehicles, the efficiency is one of the most important parameters to be optimized to reach the project targets in terms of range and vehicle performances. TUfast Eco team is involved in the design of high efficiency vehicles to participate in the Shell Eco-marathon competition. The new vehicle is called MUC022 and will take part in the 2022 season. The aim of this work is the design, in CAD environment, of the outer body shape of the car and the relative structural part, a monocoque in Carbon Fibre Reinforced Plastic material. To increase the efficiency, the weight must be reduced while the aerodynamic performances improved.