41. Coupled with a turbocharger, the engine can take advantage of the higher octane rating of ethanol and boost power. 42. The power of the engine could also change according to the octane rating of the aviation fuel being used. 43. The maximum possible boost depends on the fuel's octane rating and the inherent tendency of any particular engine toward detonation. 44. Like the 601, the 605 was designed to run on " B4 " fuel with an octane rating of 87. 45. The expected restart helped send V3 grade premium gasoline, with a 93 octane rating , lower in Gulf Coast spot markets. 46. Octane ratings measure a gasoline's ability to cut down on engine " knocking, " which happens when fuel burns unevenly.47. The problem is simply solved by using a gasoline with a higher octane rating , which makes the combustion more even. 48. Octane ratings measure a gasoline's ability to cut down on engine " knocking, " which results when fuel burns unevenly.49. It is also harmful to modern engines due to its low octane rating , high heat of combustion and lack of additives. 50. If they have received consumer complaints about poor performance, they send the gas to a lab to test its octane rating .
