Fourier Transform in measuring actual automotive mileage

A lot of people who buy second hand cars are usually able to gauge how much the car has been used by the amount of miles it has been driven. Most cars have a manual gauge that shows its mileage.

However some salespeople would manually “rewind” this gauge so that it shows less miles than what the car was driven. Software has been invented that listens to a cars engine and uses Fourier Transformations to break down the engines sounds.

From these sounds, the software will be able to accurately gauge how old the car really is and if the salesperson cheated or not.