In ECO drive mode you can push the accelerator pedal down all the way to the point of first resistance (ICE ENGINE ENGAGE POINT) and you will get maximum battery only acceleration. The power/speedo bar will go all the way to the very tip of the blue bar but will NOT kick on the ICE. With practice I am now a pro and use this 100% of the time. This has really taken my clarity driving experience to the next level. Just thought I would share.