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原文传递 Light-Duty Automotive Technology and Fuel Economy Trends: 1975 through 2007.

题名：	Light-Duty Automotive Technology and Fuel Economy Trends: 1975 through 2007.
关键词：	Motor-vehicles; Fuel-economy.;Automobiles-; Trucks-; Vehicle-consumption; Vehicle-size; Vehicle-weight; Fuel-consumption; Vehicle-performance; Motor-vehicle-engines; Cylinders-; Valves-; Transmissions-; Sales-; Trends-; Technology-innovation; Tables-Data.
摘要：	This report summarizes key trends in fuel economy and technology usage related to model year (MY) 1975 through 2007 light-duty vehicles sold in the United States. Light-dutyvehicles are those vehicles that EPA classifies as cars or light-duty trucks (sport utility vehicles, vans, and pickup trucks with less than 8500 pounds gross vehicle weight ratings). Since 1975, overall new light-duty vehicle fuel economy has moved through four phases: (1) a rapid increase from 1975 through the early 1980s, (2) a slower increase until reaching its peak in 1987, (3) a gradual decline until 2004, and (4) an increase in 2005 and 2006, with 2007 levels projected to be similar to 2006. The projected average MY2007 light-duty vehicle fuel economy, based in large part on pre-model year sales projections from automakers, is 20.2 miles per gallon (mpg). The MY2006 value is also 20.2 mpg. There is greater confidence in the MY2006 value as the database for2006 includes formal sales data for about 70%of the MY2006 fleet. The 20.2 mpg value for model years 2006 and 2007 represents a 0.9 mpg, or 5%, increase over the 19.3 mpg value for 2004, which was the lowest fuel economy value since 1980. The fuel economy values in this report are either adjusted (ADJ) EPA real-worldestimates provided to consumers, or unadjusted EPA laboratory (LAB) values. Most of the data is presented in adjusted values. Either adjusted or laboratory fuel economy may be reported as city, highway, or, most commonly, as composite (combined city/highway, or COMP). In 2006, EPA revised the methodology by which EPA estimates adjusted fuel economy to better reflect changes in driving habits and other factors that affect fuel economy such as higher highway speeds, more aggressive driving, and greater use of air conditioning. This is the first report inthis series to reflect this new real-world fuel economy methodology, and every adjusted fuel economy value in this report for 1986 and later model years is lower than previously reported. To reflect the fact that these changes did not occur overnight, these new downward adjustments are phased in, gradually, beginning in 1986, and for 2005 and later model years the new adjusted composite (combined city/highway) values are, on average, about 6%lower than under the methodology used by EPA in previous reports in this series.
报告类型：	科技报告