“It’s Easier to Pick Up a Clean Car— A Settled Reality.”
This statement can only be valid at highway speeds. In the real sense, the car’s mpg may not be affected by a little dust on the car’s body. Equally, we can say that there is no measurable effect of a bit of dirt on the cars’ mpg. However, if your vehicle has big clumps of dirt that considerably alters the flow of air along its surface, it reduces your gas mileage. This can be supported by the fact that large clumps of dust on the car’s body disrupt the air around it, creating a stir behind it, hence reducing drag.
The statement is true if we look at a clean car in the sense of a well maintained, repaired, and upgraded car, especially on the vehicle systems like intake, exhaust, suspension brake, and electrical system. For instance, replacing a dirty gas filter will enable your car to breathe easily hence using less gas, thus increasing gas mileage by more than 10%.