The motion of a car is resisted by air and this resistance is commonly referred to as air resistance. In ideal scenario, this air resistance is demonstrated and measured using a wind-tunnel facility, where a scaled model (say 1:10 or 1:20 scale model) or actual car is exposed to various air speed scenarios. There are several other simpler and more approximate ways of demonstrating air resistance on cars. For example, one can drive a car in few different conditions: still conditions (no air flow), with air flow or against air flow. In each case, the driver can determine the amount of fuel used to travel a specific distance at a pre-determined speed. Higher fuel consumption is just an indicator of extra energy required to counter the air resistance.
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