I'd probably get it out around 1K, but that is just personal preference.
An early drain is probably not strictly necessary, but it always makes me feel better.
In general, the engine will outlast every other part of the car, and you could do much worse than to use the exellent GM OLM to determine the proper change intervals for this car, including the factory fill.
If GM really thought that an early drian was needed, they'd recommend it, as Subaru does.