Why is efficiency so low in cars?

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iRamie
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Homework Statement


I am in grade 11 physics and we are learning efficiency, Eout/Ein.. stuff like that.
I just have a few questions about cars:
How is efficiency defined in cars and why is it so low in cars?
What/How are we improving efficiency?

The Attempt at a Solution


I think that it is low because some of the energy gets taken up from like the sound and the friction and all that.
 
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