A streamlined car would be more efficient than the same car without streamlining as it would present less drag. Unfortunately, streamlining by itself does not make a car efficient. Efficiency is the product of may different things such as the type of and inflation of the tires, the size and efficiency of the engine and etc.
Streamlined shapes make them faster and more fuel-efficient.
They have a streamlined bonnet so that the air will be pushed over the car.
so that the car will go faster and thecorners and the distence from the ground makes it streamlined .The rounder the corners the more streamlined it is
there is no accesory for that
By designing the car to be as streamlined as possible.
after market body panels.
Wind tunnel test
An object that is not streamlined is one that has a shape that does not minimize resistance when moving through a fluid, such as a cube or a sphere with rough edges. This can result in increased drag and turbulence, making it less efficient for moving through air or water compared to a streamlined object.
The cheetah is the most streamlined big cat.
It's mainly to reduce fuel consumption. A streamlined shape needs less energy to push it forward against standard air pressure - than one that isn't streamlined.
A car can be streamlined by adding inserts to the sides or top to redirect air, or the shape can be changed to become more aerodynamic, or to redirect the air around to avoid being slowed down by air.
Streamlining lowers drag and turbulence around the airfoil. Drag and turbulence take away from an object's efficient passing through a medium. That inefficiency results in higher fuel consumption as the greater drag is overcome, all other things being equal. It's no accident that race cars are built like they are.