Sphere - A very good aerodynamic shape because of it symmetrical shape. Which allows air to flow over it's surface with very little disruption to the air stream. A combination of basic shapes will yield the best results. This equation has to do with how much weight is over the front and rear of the vehicle.
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In addition to these two types of resistances, the vehicle has to overcome grade resistance when it moves up on a gradient, because the weight of the vehicle is to be lifted through a vertical distance. Hence, the power required to propel a vehicle is proportional to the total resistance to its motion and the speed.
It slips through the air with a remarkable drag coefficient of just Cd 0.25, which has secured its position as the world's most aerodynamic hatchback as well as one of the most instantly recognisable.