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

Excel | CSV

  1960 1965 1970 1975 1980 1985 1990 1995 1996 1997 1998 1999 2000
Vehicle-kilometers (millions)                          
Passenger car 944,685 1,163,556 1,475,768 1,664,062 1,789,591 2,006,852 2,265,956 2,314,237 2,365,736 2,418,844 R2,494,483 2,525,061 2,578,169
Other 2-axle 4-tire vehicle N N 197,949 323,478 468,319 629,254 925,373 1,271,382 1,314,834 1,369,552 R1,396,911 1,450,019 1,487,034
Motorcycle b b 4,828 9,012 16,415 14,645 15,450 15,772 15,933 16,254 R16,576 17,059 16,898
Passenger-kilometers (millions)a                          
Passenger car 1,842,699 2,245,035 2,817,961 3,144,658 3,238,000 3,369,966 3,672,523 3,680,570 3,761,037 3,844,723 R3,965,424 4,015,313 4,098,999
Other 2-axle 4-tire vehicle N N 363,712 584,192 838,468 1,107,229 1,609,344 2,021,336 2,088,929 2,177,442 R2,222,504 2,306,190 2,364,126
Motorcycle b b 4,828 9,656 19,312 19,312 19,312 17,703 17,703 17,703 17,703 19,312 19,312
Fuel consumed (million liters)                          
Passenger car 155,849 188,222 256,723 280,650 264,911 270,725 263,344 257,681 262,030 264,570 R271,395 277,406 276,017
Other 2-axle 4-tire vehicle N N 46,610 72,229 90,078 103,580 134,802 172,634 179,254 186,954 R191,019 200,093 199,991
Motorcycle b b 227 428 772 689 723 742 750 765 R780 801 795
Energy intensity (kilojoule/passenger-kilometer)c                          
Passenger car 2,947 2,921 3,174 3,109 2,850 2,799 2,498 2,439 2,427 2,397 R2,384 2,407 2,346
Other 2-axle 4-tire vehicle N N 4,465 4,308 3,743 3,259 2,918 2,975 2,990 2,991 R2,995 3,023 2,947
Motorcycle a a 1,639 1,543 1,393 1,243 1,304 1,460 1,475 1,505 R1,535 1,446 1,434

KEY: Btu = British thermal unit; N = data do not exist; R = revised.

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 Energy intensity (kilojoule/passenger-kilometer) is calculated by converting the fuel consumption in gallons to the energy equivalent kilojoule units and dividing by the passenger-kilometers. The heat equivalent factor used for kilojoule conversion is 34,839,537 joules/liter.

c Included in passenger car.

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.

1.609344 kilometers = 1 mile.

3.785412 liters = 1 gallon.

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.

1995-2000: 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.

1995-2001: 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-miles are subtracted from the combined passenger car and motorcycle vehicle-miles from VM-201A. These numbers were then converted to kilometers.

1990-2001: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.

Passenger-kilometers:

1960-97: Vehicle-miles multiplied by vehicle occupancy rates.

1998-2001: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.

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.

1995-2001: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.