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[Sundrop]

Silly question:

Code:

IEnumerator Task ()
{
    yield return AnotherTask (); 
}

IEnumerator AnotherTask()
{
    while (enabled)
    {
        // do something

        yield return null;
    }
}

Will this code cost 2 coroutines worth of RAM or 1? Seems silly to ask but I wanna make sure since I'm doing this a lot.  

[Ordnas]

It is a Synchronous Coroutine, execution of Task() is suspended during the execution of AnotherTask(), so internally there is no need to start another coroutine. You can optimize doing:

IEnumerator Task ()
{
while (enabled)
    {
        // do something

        yield return null;
    }
}

It has the same result, but it will be executed in the same frame instead of waiting the next frame.

[EmeraldPawn]

Do it the way that causes less headache for you in the future, you really don't need to optimize for RAM useage for a coroutine. Write code that you can read and modify later, and optimize when you need to but base it in profiler data, not a hunch. Remember, premature optimization is the root of all evil.
Cheers!