Which of the following is not a use of gasoline blend like gasoline mixed with tetraethyl lead in internal combustion engine?

Which of the following is not a use of gasoline blend like gasoline mixed with tetraethyl lead in internal combustion engine? Correct Answer Allows engine to operate at low compression ratio

Gasoline blend in IC engine increases the octane rating fuel and allows engine to operate at high compression ratio. Gasoline blend is use to avoid auto ignition in internal combustion engine.
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