Nothing mysterious there; in the Fibonacci sequence, the ratio of the number and the one before it converges to the golden ratio which is almost the same as the

Nothing mysterious there; in the Fibonacci sequence, the ratio of the number and the one before it converges to the golden ratio which is almost the same as the conversion rate between km and miles. I think it is easier to multiply by 0.6. Or do the simpler approximation: n/2 + n/10 + ( n/100 )*2 You can drop the last term if you don't need an accurate result. Divisions and multiplications by 2, 10 and 100 are really easy. 850km to miles: 425 + 85 + 17 = 527 miles , the correct result is 528.166 miles 258km to miles: 129 + 26 + 5 = 160 miles , correct result is 160.314 miles