The exhaust is a gas.
why is it called lean…?
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I asked an A.I. chatbot and it said:
The term “gas” in gasoline actually refers to its ability to vaporize at a relatively low temperature ². Gasoline is a mixture of volatile, flammable liquid hydrocarbons derived from petroleum and used as fuel for internal-combustion engines ¹. It’s also called petrol in some countries ³.
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Why is what called lean?
Because its not rich enough to change its name 
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It’s short for “gasoline”.
The name of the girl with one leg standing against a wall? Eileen?
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