Assertion: fuel's rating | /r/CapableOf | prevent engine detonation
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text: It has a high octane" rating, which prevents engine detonation (knock) under load,  it burns clean ... so clean, in fact, that not only are noxious emissions drastically reduced, but the internal parts of the engine are purged of carbon and gum deposits ... which, of course, do not build up as long as alcohol is used as fuel,  an alcohol burning engine tends to run cooler than its gasoline-powered counterpart, thus extending engine life and reducing the chance of overheating.