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Originally Posted by roflwaffle
For instance the efficiency of an SUV at 80mph on the highway is going to be fairly high even if it has poor efficacy.
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How so? Seems to me that in its default (i.e. most commonly seen) one person mode, it's pretty inefficient, even apart from the IC engine. You're accelerating a large mass, shoving lots of air out of the way, incurring rolling resistance from big tires...
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...in any event I think 70% for EVs is pretty reasonable.
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There's also the second-order factors. So for oil you have 100% of a barrel in the ground somewhere in say Saudi Arabia. You need some amount of energy to pump it out of the ground & push it through pipelines to a loading dock, energy to run the oil tanker to destination, energy to run the refinery, more to run pipelines & delivery trucks, and a last little bit to run the pump at the gas station.
I don't know what that all adds up to, but it doesn't seem unreasonable that it'd be in the same range as a 30% grid plus charging loss for electric.