I asked the dealership if Ford had any information on adding an extra Li-Ion battery in parallel. I don't suppose they can change the programming to reflect that extra power, and readjust to grab more power from the battery. I'm thinking of getting a solar tonneau cover that would have a 2 kWh battery. Any thoughts on that concept?If you push the accelerator beyond a gentle whisper, it will turn on the ICE for extra power, but the ICE will usually also shut off as soon as your release the accelerator. The amount of accelerator input to stay under battery power is something you have to do very purposefully -- it is really a very small window of acceleration. It's not that hard to do if you are driving slow on urban streets 25mph and under, but if you're on more 'regular' urban streets of like 35mph and above, you will probably make others angry if you accelerate sloooooowly to stay on battery power. That's not really even the best method for efficiency (look up "pulse and glide"). Even though the battery CAN provide more power, they have programmed it to be relatively minimal since it's a small battery. Even so, it's quite effective, as you can see by peoples' excellent MPG results so far. I imagine they calculated an optimal battery usage for longevity rather than performance. And like others said, the ICE will turn on to recharge the battery as needed.
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