Typ ical mid-1920’s gasoline was 40-60 octane. The mid-fifties aphorism the start of the increase of the compression ratio, requiring higher octane fuels. Octane ratings, lead levels, and dehydration pressure increased, whereas sulfur content decreased. Minor improvements were do to gasoline formulations to improve yields and octane until the 1970s – when unleaded fuels were introduced to protect the oust catalys...If you ask to get a full essay, order it on our website: OrderCustomPaper.com
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