You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when did they start putting ethanol in gas?" whose answer is the late 1970s.
Each document should contain about 30 words, and these documents should contain useful information.

Query: history of ethanol in gasoline
Useful Output:

Doc 1: Since 1826, when it was first used to power internal combustion engines (ethanol timeline), ethanol has been of interest to entrepreneurs and agriculturists.
Doc 2: In the 19th century, ethanol found application as lamp fuel because it was clean and produced minor burning residuum, and was also used as
Doc 3: Ethanol has replaced portions of gasoline in three main blend levels, with corresponding vehicles, equipment, benefits, and policies.
Doc 4: This report documents the roughly 50 years it took for ethanol to achieve the market share it sees today. It looks at the history of gasoline
Doc 5: Henry Ford's early vehicles ran on ethanol, which became commercially significant in the 1970s after the phase-out of lead in gasoline.