using System;

public class Program

{

    public static void Main()

    {

            int oldMileage = 100;

            int mileage = 101;

            int threshold = 0;    

            var odoDiff = Math.Abs(mileage - oldMileage);

​

            var isoutside = odoDiff > threshold;

            Console.WriteLine(odoDiff);

            Console.WriteLine(oldMileage);

            Console.WriteLine(mileage);

            Console.WriteLine(isoutside);

    }

}