How to ask Mathematica to display all the logarithms (in output) in base 2?

Question

How to ask Mathematica to display all the logarithms (in output) in base 2? Instead it always displays in base $e$.

Very often, I need to do a lot of things with mixed expressions having some $\log_2$ terms. But Mathematica always converts every $\log_2$ into $\ln$. So I was wondering how to ask Mathematica to retain the $\log_2$.

Answer 1

As mentioned in previous answers, there is an undocumented(!) setting for this:

SetSystemOptions["SimplificationOptions" -> "AutosimplifyTwoArgumentLog" -> False];

Log2[] should stop expanding out after this.