Tesla Motors Club

Something I've been trying to get my head around is the effect of relatively hard acceleration on efficiency on our vehicles. In an ICE vehicle the efficiency takes a nosedive with hard acceleration for many reasons, but with our electric motors at 93%/97% efficiency (depending on model) and only one gear ratio, how does this translate? Does the efficiency change according to how hard we accelerate? Assuming you don't lose traction then the extra losses are in flexion of the tyres, which doesn't amount to much. Does the energy efficiency otherwise change at different levels of acceleration? If you maintain traction, and only accelerate hard to the speed limit, is it really that much less efficient than accelerating slowly to the speed limit? Does anyone know of any relevant graphs that can portray this?