Hackintoshes have been benchmarked by the community and by and large they hold up quite poorly when it comes to battery life. It seems to be a larger issue with power management in general when the hardware is so generalized.
That being said, there is no reason Microsoft's own drivers shouldn't work as good if not better on the Surface. The power management on these devices should be the benchmark for other companies to attempt to live up to.
That being said, there is no reason Microsoft's own drivers shouldn't work as good if not better on the Surface. The power management on these devices should be the benchmark for other companies to attempt to live up to.