" By 1936, 90 percent of all US gasoline was leaded. Domestic consumption of tetraethyl lead reached a high of 5.1 million pounds in 1956. In 1959 the US Public Health Service supported an Ethyl Corporation request to increase the lead content of gasoline from 3 cc to 4 cc per gallon—because refiners had reached a limit in improving fuel through refining and were now losing yield to keep up octane. "
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