EFFECT OF VEHICLE SIZE AND ENGINE DISPLACEMENT ON AUTOMOBILE FUEL CONSUMPTION

Analysis of EPA data on 1977 automobiles shows that rate of fuel consumption increases roughly linearly with automobile weight. This is largely the consequence of engine size that is proportional, on the average, to the 1.8th power of the weight. However, increased consumption due to larger engine size is partially offset by a specific engine efficiency that improves linearly with increasing engine size. The specific consumption, measured as gal/(in 3-lb/mi), is inversely proportional to engine displacement. It is suggested that sacrifice of body size (i.e. weight) to obtain improved overall fuel consumption is only one possible trade-off; an alternative might be sacrifice of performance while retaining size which might be more acceptable to one section of the market. (a) (TRRL)

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  • Corporate Authors:

    Pergamon Press, Incorporated

    Headington Hill Hall
    Oxford OX30BW,    
  • Authors:
    • Essenhigh, R H
    • Shull, H E
    • Blackadar, T
    • McKinstry, H
  • Publication Date: 1979-6

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Filing Info

  • Accession Number: 00310405
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Report/Paper Numbers: SERIAL
  • Files: ITRD, TRIS
  • Created Date: Jun 26 1980 12:00AM