The way I am reading this may not be correct, nor is my understanding of the system. So please be gentile and teach me if I am wrong (I don't have an LC yet but I do have a Rav4 Hybrid....) but:
I don't think downshifting has any benefit to regenerating power to the batteries unless it's literally that because the engine is running it is charging the battery. However, my understanding is braking, until you really get into them, does. So, my understanding which is based on a Rav Prime which may not translate, is that if you are truly hypermiling your best benefit would be from coasting down the hill / light braking application. Downshifting won't get much of a benefit. Furthermore, if you anticipate stopping, and want the best hypermiling performance, you would brake early vs wait until the last second. The regenerative braking is effective until you get pretty into the brakes, then it uses the brake pads to stop.
