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by reducing the mass you reduce the friction, and by reducing the friction reduce the fuel needed to move the car, this applies to all cars not only CO2 cars.
The most common features in modern cars that help to reduce air friction is the streamlined design of the bumpers and spoilers. The streamlined shape of fast cars also helps to reduce drag.
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To reduce air friction.
If friction is zero no one would be able to walk along a street and no vehicles or cars can be driven.
Friction.
Streamlining helps the cars reduce friction, which makes them have better gas mileage and be able to move faster.
Friction between the brake pad/lining and the rotor/drum and friction between the tyre and the road.
aerodynamic exteriors to make them more slippery in the wind.
remove as much space touching the surface which will cause friction.
Snow decreases the friction between your shoes and ground. That's why cars slide in the winter.
The cause of aerodynamic depends on a shape of an object for example a rocket a has a good aerodynamic because it has a smooth finish which helps to reduce the friction. The new cars like ferrari and Verizon has a pointy shape which helps to reduce the friction . The lorries and vans can't go faster because of its shape. In order to have aerodynamic the body should be streamlined.