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20 km is 12 miles. Wikipedia says this:
"Toyota estimates that the all-electric range varies between 10 to 15 miles (16 to 24 km) on a full charge depending on quick acceleration and braking, road and vehicle conditions, or climate control use."
This is what I copy-pasted from some forum:
"Consumer Reports field tested the Prius PHV for two weeks and reported an all-electric range between 14 to 17 miles (23 to 27 km) "
I just took the average from the first source, but it seems you can go 23-27 km in real world. Another assumption I made is 95% efficiency of electric motor and drivetrain. I don't how much it is, but if it as low as 80%, the Prius should go 25 miles. That's almost 150% of what it actually does. Cd can't be 0.25.
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