21. Where fuel quality is low and octane rating is poor, compression ratios will be restricted. 22. Gasoline is produced in several grades of octane rating . 23. Ethanol is used to boost octane ratings in gasoline. 24. Also, his 2, 200 workers are producing lower quality gasoline with an octane rating of 81. 25. The manufacturer recommends the use of unleaded gasoline with an octane rating of at least 95. 26. Gasoline produced from the Green Crude achieved a 91 octane rating while meeting fuel quality standards. 27. The octane rating of a given fuel is a measure of the fuel's resistance to self-ignition. 28. Phillips turned to technology to increase the octane rating of fuels for use in advanced engines. 29. Conversely, a fuel with lower octane rating is more prone to knocking and will lower efficiency. 30. Direct cylinder injection raises the already high octane rating of ethanol up to an effective 130.
