Originally Posted by jm1234
Transmission line losses run less than 10% (the miracle of I^2R). Car engines run around 20% energy efficiency. Gas turbines do closer to 40%. I think nuclear plants run >90%. I'm not sure you would get up to 90% lost energy if you follow the energy from the source (chemical, nuclear, solar, wind, whatever it's initial form) to the car. That pessimistic.
I was surprised to hear someone mention that number as well, but then he showed me where it comes coming from and it made sense. Let me try to find that diagram...