I'd kind of leaning towards thinking that the Log() function will only return Double level precision, so I doubt that using Decimals will offer any improvement
My thoughts were that it made the Array values Decimal. It doesn't make much difference in the first calculation which is just adding the squares of the difference in two numbers, but in the second calculation, which is a chain of multiplications, it seems to rally help. Of course Maxximo told me in a PM that 3 in the 3rd is good enough for him.

Like Richard Pryor in Superman, I want to balance my accounts to the hundred thousandths of a mil.