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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.
Streamlining helps the cars reduce friction, which makes them have better gas mileage and be able to move faster.
By lubrication and using polished surfaces and avoiding the striking mechanism of 2 parts in an engine...
F1 cars need friction for their brakes, if they didn't have friction on there brakes then it wouldn't be able to brake.
when you walk; wheels roll to move cars; you grasp something in your hand; cars brake; these are all because of friction. Really there are advantages of friction.
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.
aerodynamic exteriors to make them more slippery in the wind.
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 friction material in the braking system
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.