Table 4-13:  Single-Unit 2-Axle 6-Tire or More Truck Fuel Consumption and Travela,,,,,,,,,,,,,,,
,1970 ,1975 ,1980 ,1985 ,1990 ,1991 ,1992 ,1993 ,1994 ,1995 ,1996  ,1997 ,R1998,1999 ,2000 
Number registered (thousands),"3,681","4,232","4,374","4,593","4,487","4,481","4,370","4,408","4,906","5,024","R5,266","5,293","5,735","5,763","5,926"
Vehicle-miles (millions),"27,100","34,600","39,800","45,400","51,900","52,900","53,900","56,800","61,300","62,705","R64,072","66,893","68,021","70,304","70,583"
Fuel consumed (million gallons),"3,968","5,420","6,923","7,399","8,357","8,172","8,237","8,488","9,032","9,216","R9,408","9,576","6,817","9,372","9,548"
Average miles traveled per vehicle (thousands),7.4,8.2,9.1,9.9,11.6,11.8,12.3,12.9,12.5,12.5,12.2,12.6,11.9,12.2,11.9
Average miles traveled per gallon,6.8,6.4,5.8,6.1,6.2,6.5,6.5,6.7,6.8,6.8,6.8,7.0,10.0,7.5,7.4
Average fuel consumed per vehicle (gallons),"1,078","1,281","1,583","1,611","1,862","1,824","1,885","1,926","1,841","1,835","R1,787","1,809","1,189","1,626","1,611"
KEY: R = revised.,,,,,,,,,,,,,,,
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"a Beginning in 1998, the Federal Highway Administration (FHWA) used the Census Bureau's 1997 Vehicle Inventory and Use Survey (VIUS) for its baseline estimate of single-unit 2-axle 6-tire or more trucks.  Prior to 1998, the FHWA used the Census Bureau's 1992 Transportation Inventory and Use Survey (TIUS) for its baseline estimates.  Therefore, post-1997 data may not be comparable to 1997 and earlier years.",,,,,,,,,,,,,,,
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"NOTES: In 1995, the U.S. Department of Transportation, Federal Highway Administration revised its vehicle categories beginning with 1993 data to include passenger cars, other 2-axle 4-tire vehicles, single-unit 2-axle 6-tire or more trucks, and combination trucks. Single-unit 2-axle 6-tire or more trucks are on a single frame with at least 2 axles and 6 tires.  Pre-1993 data have been reassigned to the most appropriate category. ",,,,,,,,,,,,,,,
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"SOURCES:  1965-94:  U.S. Department of Transportation, Federal Highway Administration, Highway Statistics Summary to 1995, FHWA-PL-97-009 (Washington, DC:  July 1997), table VM-201A. ",,,,,,,,,,,,,,,
"1995-2000: Ibid., Highway Statistics (Washington, DC:  Annual issues), table VM-1.",,,,,,,,,,,,,,,
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