On: What does a kilowatt hour look like?

[revelation]

A kWh gets me easily >30km on my bike (250W for 1h if you assume average 25% efficiency)

[titzer → revelation]

Drivetrains on bikes can be > 98% efficient, so I assume you mean the human power output efficiency. But 250W applied directly to the crank via an electric motor should get you a good 40km/h for 4 hours! :)

[adrianN → revelation]

But you don't ride at highway speeds ;)

[whamlastxmas → adrianN]

Bike also doesn't weigh 2500 pounds