The EPA certification data base is the most extensive available body of information relating engineering variables to fuel economy. The range and distributions of these variables are presented in a nonsales weighted context. A multiple regression analysis, performed with careful attention to selection of optimum non-linear forms for some of the variables, shows that the most significant determinant of fuel economy is the parameter CID x N/V. Vehicle weight is second. A method is devised for quantifying ignition timing over a driving cycle in terms of a single "labeling" value usable as an engineering variable. An apparent inverse relationship between fuel economy and the stringency of emission controls can be overcome with the concurrent passage of time and the evaluationary application of improved technology. /GMRL/

Media Info

  • Pagination: 24 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00142403
  • Record Type: Publication
  • Report/Paper Numbers: SAE #750958
  • Files: TRIS
  • Created Date: Apr 13 1977 12:00AM