Would seem like a negligible amount of power usage for OA but might be worth a couple of tests to find out. I find the only time I use OA is when I'm using a camera mode that requires it. Otherwise I find it slows one down too much or gets in the way in tight quarters when I would like to use it.So, I regularly use sport mode to get to/from a spot of interest, but I was more interested in switching off OA while in P mode to increase flight time. The assumption is that it would consume less power, which might give you a bit more flight time. Since the motors are drawing a lot of current, not running the OA process(es) may not be significant in terms of power management.