Table 4-24M: Energy Intensity of Transit Motor Buses
| 1960 | 1965 | 1970 | 1975 | 1980 | 1985 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Vehicle-kilometers (millions) | 2,537 | 2,460 | 2,268 | 2,456 | 2,699 | 2,998 | 3,428 | 3,487 | 3,505 | 3,556 | 3,479 | 3,514 | 2,692 | 2,744 | 2,841 | 2,931 | 2,993 | 3,079 | 3,077 | 2,997 | 2,976 | 2,961 | 2,956 | 2,995 | 3,050 | 3,060 | 2,974 |
| Passenger-kilometers (millions) | N | N | N | N | 35,068 | 34,055 | 33,766 | 33,941 | 32,728 | 32,584 | 30,307 | 30,285 | 25,460 | 26,565 | 27,248 | 28,253 | 28,365 | 29,535 | 29,104 | 27,463 | 26,847 | 27,413 | 28,149 | 28,131 | 29,449 | 28,976 | 28,435 |
| Energy consumed | |||||||||||||||||||||||||||
| Diesel fuel (million liters) | 787 | 939 | 1,026 | 1,382 | 1,632 | 1,961 | 2,132 | 2,169 | 2,241 | 2,179 | 2,139 | 2,134 | 1,763 | 1,754 | 1,773 | 1,804 | 1,853 | 1,862 | 1,773 | 1,672 | 1,668 | 1,421 | 1,597 | 1,535 | 1,526 | 1,462 | 1,397 |
| Compressed Natural Gas (million liters) | N | N | N | N | N | N | N | N | N | N | N | 38 | 38 | 67 | 103 | 126 | 159 | 193 | 246 | 296 | 323 | 351 | 413 | 402 | 421 | 470 | 402 |
| Bio-diesel (million liters) | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | 3 | 3 | 8 | 195 | 61 | 78 | 125 | 134 | 119 |
| Liquefied natural gas (million liters) | N | N | N | N | N | N | N | N | N | N | N | 6 | 8 | 12 | 10 | 17 | 33 | 37 | 53 | 44 | 50 | 55 | 58 | 57 | 56 | 52 | 50 |
| Gasoline (million liters) | N | N | N | N | N | N | N | N | N | N | N | 9 | 4 | 5 | 6 | 4 | 4 | 5 | 4 | 3 | 5 | 3 | 7 | 7 | 11 | 11 | 13 |
| Other major fuelsa (million liters) | N | N | N | N | N | N | N | N | N | N | N | N | 43 | 34 | 16 | 9 | 3 | 4 | 8 | 8 | 8 | 11 | 8 | 4 | 3 | 4 | 2 |
| Powerb (million KWH) | N | N | N | N | N | N | N | N | N | N | N | N | (R) 1 | (R) 1 | (R) 2 | (R) 3 | (R) 4 | (R) 4 | (R) 10 | (R) 5 | (R) 7 | (R) 5 | (R) 5 | (R) 4 | (R) 4 | (R) 3 | 3 |
| Energy consumed, total (Billion kilojoules) | N | N | N | N | N | N | N | N | N | N | N | N | 69,603 | 69,471 | 69,992 | 71,266 | 73,644 | 74,334 | 71,846 | 68,023 | 68,389 | 65,721 | 68,317 | 66,322 | 67,780 | 65,957 | 62,395 |
| Diesel fuel | 30,438 | 36,291 | 39,657 | 53,413 | 63,071 | 75,817 | 82,409 | 83,830 | 86,638 | 84,252 | 82,689 | 82,500 | 68,160 | 67,799 | 68,541 | 69,751 | 71,646 | 71,974 | 68,535 | 64,642 | 64,464 | 54,914 | 61,729 | 59,337 | 58,981 | 56,523 | 54,017 |
| Compressed Natural Gas | N | N | N | N | N | N | N | N | N | N | N | 237 | 240 | 420 | 647 | 790 | 999 | 1,211 | 1,543 | 1,856 | 2,027 | 2,199 | 2,589 | 2,521 | 2,640 | 2,950 | 2,519 |
| Bio-diesel | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | 103 | 113 | 283 | 6,850 | 2,138 | 2,745 | 4,380 | 4,721 | 4,169 |
| Liquefied natural gas | N | N | N | N | N | N | N | N | N | N | N | 152 | 200 | 289 | 230 | 392 | 781 | 875 | 1,253 | 1,049 | 1,178 | 1,295 | 1,381 | 1,354 | 1,330 | 1,238 | 1,174 |
| Gasoline | N | N | N | N | N | N | N | N | N | N | N | 303 | 132 | 175 | 199 | 143 | 134 | 163 | 139 | 122 | 190 | 102 | 243 | 251 | 373 | 394 | 440 |
| Other major fuelsa | N | N | N | N | N | N | N | N | N | N | N | N | 867 | 786 | 368 | 182 | 73 | 101 | 246 | 225 | 226 | 349 | 223 | 101 | 65 | 122 | 74 |
| Powerb | N | N | N | N | N | N | N | N | N | N | N | N | 3 | 3 | 7 | 9 | 10 | 11 | 27 | 15 | 21 | 13 | 13 | 11 | 10 | 8 | 3 |
| Energy intensity (kilojoules/passenger-kilometer) | N | N | N | N | N | N | N | N | N | N | N | N | 2,734 | 2,615 | 2,569 | 2,522 | 2,596 | 2,517 | 2,469 | 2,477 | 2,547 | 2,397 | 2,427 | 2,358 | 2,302 | (R) 2,276 | 2,194 |
KEY: N = data do not exist; R = revised.
a Before 2002, Other major fuels include liquefied petroleum gas, methanol, ethanol, and bunker fuel. From 2002 to 2010, Other major fuels include liquefied petroleum gas, methanol, ethanol, bunker fuel, kerosene, and grain additive.
b Power includes electric propulsion and electric battery.
NOTES
Data from 1996 and after are not comparable to the data for earlier years or to the data published in previous editions of the report due to different data sources used.
Data from 1996 and after are for those vehicles used for directly operated (DO) services only .
Energy consumed, total does not include the other types of energy identified in table 17 in the National Transit Database due to the lack of information on the unit of measurement for such data before 2008.
The following conversion rates were used:
Diesel =38,657.95 kilojoules/liter.
Compressed Natural Gas = 6,271.117 kilojoules/liter.
Bio-Diesel = 35,174.00 kilojoules/liter.
Liquefied natural gas = 23,635.15 kilojoules/liter.
Gasoline = 34,839.54 kilojoules/liter.
Liquefied petroleum gas = 25,446.80 kilojoules/liter.
Methanol = 18,005.07 kilojoules/liter.
Ethanol = 23,579.40 kilojoules/liter.
Bunker fuel = 41,723.83 kilojoules/liter.
Kerosene = 37,626.70 kilojoules/liter.
Grain additive = 33,696.80 kilojoules/liter.
Electricity 1KWH = 3,412 Btu, negating electrical system losses. This table includes approximate electrical system losses, and thus the conversion factor is multiplied by 3.
1.609344 kilometers = 1 mile.
3.785412 liters = 1 gallon.
1.055056 kilojoules = 1 British thermal unit (Btu).
SOURCES
1960-95: American Public Transportation Association, 2010 Public Transportation Fact Book Appendix A: Historical Tables (Washington, DC: Annual Issues), tables 2, 6, 30, 32 and similar tables in earlier editions, available at http://www.apta.com/resources/statistics/Pages/transitstats.aspx as of Aug 23, 2010.
1996-2010: U.S. Department of Transportation, Federal Transit Administration, National Transit Database, tables 17, 19, and similar tables in earlier editions, available at http://www.ntdprogram.gov/ntdprogram/data.htm as of Mar. 14, 2012.