Table 4-22M. Energy Intensity of Passenger Cars, Other 2-Axle 4-Tire Vehicles, and Motorcycles

Table 4-22M. Energy Intensity of Passenger Cars, Other 2-Axle 4-Tire Vehicles, and Motorcycles

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  1960 1965 1970 1975 1980 1985 1990 1991 1992 1993 1994 1995 1996 1997 1998
Vehicle-kilometers (millions)                             
Passenger car R944,687 R1,163,558 R1,475,771 R1,664,065 R1,789,594 R2,006,856 R2,265,961 2,185,493 2,208,024 2,212,852 2,262,742 R2,314,241 R2,365,740 R2,418,849 2,488,050
Other 2-axle 4-tire vehicle N N R197,950 R323,479 R468,320 R629,255 R925,375 1,044,466 1,137,808 1,200,573 1,231,150 R1,271,384 R1,314,836 R1,369,554 1,393,695
Motorcycle b b 4,828 9,012 16,415 14,645 15,450 14,806 15,450 15,933 16,415 15,772 15,933 16,254 16,576
Passenger-kilometers (millions)a                             
Passenger car R1,842,702 R2,245,039 R2,817,967 R3,144,664 R3,238,006 R3,369,973 R3,672,530 3,540,563 3,553,438 3,561,485 3,621,031 R3,680,577 R3,761,044 R3,844,730 3,955,775
Other 2-axle 4-tire vehicle N N 363,712 R584,193 R838,470 R1,107,231 R1,609,347 1,797,641 1,934,435 2,016,512 2,042,261 R2,021,340 R2,088,932 R2,177,446 2,216,071
Motorcycle b b 4,828 9,656 19,312 19,312 19,312 19,312 19,312 19,312 19,312 R17,703 R17,703 R17,703 17,703
Fuel consumed (million liters)                             
Passenger car 155,849 188,222 256,723 280,650 264,911 270,725 263,344 243,466 247,702 253,804 256,931 257,681 262,030 R264,570 273,341
Other 2-axle 4-tire vehicle N N 46,610 72,229 90,078 103,580 134,802 144,667 154,933 162,209 166,982 172,634 179,254 R186,954 191,462
Motorcycle b b 227 428 772 689 723 697 723 750 776 742 750 765 776
Energy intensiveness (1,000 Joules/passenger-kilometer)R                             
Passenger car 2,947 2,921 3,174 3,109 2,850 2,799 2,498 2,396 2,429 2,483 2,472 2,439 2,427 2,397 2,407
Other 2-axle 4-tire vehicle N N 4,465 4,308 3,743 3,259 2,918 2,804 2,790 2,803 2,849 2,975 2,990 2,991 3,010
Motorcycle a a 1,639 1,543 1,393 1,243 1,304 1,257 1,304 1,352 1,400 1,460 1,475 1,505 1,527

a Passenger-kilometers are derived by multiplying vehicle-kilometers by an average occupancy rate for that vehicle type based on data provided by the Federal Highway Administration, Nationwide Personal  Transportation Survey, 1977, 1983, 1995. Average vehicle occupancy rates are as follows: passenger car (1960-97): 1.95, 1.93, 1.91, 1.89, 1.81, 1.68, 1.62, 1.62, 1.61, 1.61, 1.60, 1.59, 1.59, 1.59;  other 2-axle 4-tire vehicle (1960-97): 1.87, 1.85, 1.83, 1.81, 1.79, 1.76, 1.74, 1.72, 1.70, 1.68, 1.66, 1.64, 1.64, 1.64; motorcycle (1960-97): 1.1, 1.1, 1.1, 1.1, 1.2, 1.3, 1.3, 1.27, 1.25, 1.23, 1.21, 1.18, 1.18, 1.18.  
b Included in passenger car.  

KEY: N = data do not exist; R = revised. 

NOTES: In 1995, the U.S. Department of Transportation, Federal Highway Administration revised its vehicle type categories for 1993 and later data.  These new categories include passenger car, other 2-axle 4-tire vehicle, single-unit 2-axle 6-tire or more truck, and combination truck.  Other 2-axle 4-tire vehicle includes vans, pickup trucks, and sport utility vehicles. In previous years, some minivans and  sport utility vehicles were included in the passenger car category. 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 closest available category. 
The heat equivalent factor used for joules conversion is 34,839,537 joules/liter. 

SOURCES: 
Vehicle-kilometers: 
Passenger car: 
1960-94: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics Summary to 1995, FHWA-PL-97-009 (Washington, DC: July 1997), table VM-201A. 
1995-98: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1. 
Other 2-axle 4-tire vehicle: 
1960-94: Ibid., Highway Statistics, Summary to 1995, FHWA-PL-97-009 (Washington, DC: July 1997), table VM-201A. 
1995-98: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1. 
Motorcycle: 
1970-85: Ibid., Highway Statistics, Summary to 1985 (Washington, DC: 1986), table VM-201A. For 1970-94, the unrevised motorcycle vehicle-kilometers are subtracted from the combined passenger car and motorcycle vehicle-kilometers from VM-201A.
1990-98 Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1. 
Passenger-kilometers: Passenger-kilometers multiplied by vehicle occupancy rates.
Fuel consumed:
1960-94: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics Summary to 1995, FHWA-PL-97-009 (Washington, DC: July 1997), table VM-201A. For 1970-94, the unrevised motorcycle fuel consumed is subtracted from the combined passenger car and motorcycle fuel consumed from VM-201A.
1995-98: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.