C# Problem bei Ausgabe (gleicher Abstand)

public static void Main()
			{
	 		Console.WriteLine("i\t\t F_i\t\t\t\t      fibonacci1\t\t       fibonacci2    ");
			Console.WriteLine("===============================================");
			for (int i=5;i<=40;i++)
				{
				var time1 = DateTime.Now;
				int erg=fibonacci1(i);			
				var time2 = DateTime.Now;
				Console.Write(i);
				Console.Write("\t\t");
				Console.Write(erg);
				Console.Write("\t\t\t\t\t");
				Console.Write("{0:F6}s", (DateTime.Now - time1).TotalSeconds);
				Console.Write("\t\t");
				Console.Write("{0:F6}s", (DateTime.Now - time2).TotalSeconds);
				Console.Write("\n");
				}
			
			}

i.ToString().PadLeft( xyz );

public static void Main()
        {
            Console.WriteLine("i\tF_i\t\tfibonacci1\tfibonacci2    ");
            Console.WriteLine("===============================================");

            int x = 2;

            for (int i = 5; i <= 40; i++)
            {
                var time1 = DateTime.Now;
                var time2 = DateTime.Now;
                string format = "\t";

                x *= 2;

                Console.Write(i);
                Console.Write(format);
                Console.Write(x);

                if (x.ToString().Length < 8)
                {
                    format += "\t";
                }

                Console.Write(format);

                Console.Write("{0:F6}s", (DateTime.Now - time1).TotalSeconds);
                Console.Write("\t");
                Console.Write("{0:F6}s", (DateTime.Now - time2).TotalSeconds);
                Console.Write("\n");
            }
            Console.ReadKey();
        }