Input (grade 13): At its inception, the IRL used methanol racing fuel, which had been the de facto standard in American open wheel racing since the 1964 Indianapolis 500 Eddie Sachs - Dave MacDonald crash.
Output (grade 7): At its inception, the IRL used methanol racing fuel. Methanol has been the standard choice in American open wheel racing since a fiery crash at the 1964 Indianapolis 500.