Federal Exhaust Emission Certification Standards for Newly Manufactured Gasoline- and Diesel-Powered Light-Duty Trucks

KEY: CO=carbon monoxide; GVWR=gross vehicle weight rating; HC=hydrocarbons; LVW=loaded vehicle weight; NMHC=non-methane hydrocarbons; NMHC=nonmethane hydrocarbons; NMOG=nonmethane organic gases; NOx=nitrogen oxides. 

^a Light-duty truck categories LDT1-LDT4 were not created until 1994.  From 1968 to 1978 all trucks with a GVWR up to 6,000 pounds were classified as light-duty trucks and were required to meet the same standards.  As of 1979, the maximum weight was raised to 8,500 pounds GVWR.  During 1988-93, light-duty trucks were divided into two...

Federal Exhaust Emission Certification Standards for Newly Manufactured Gasoline- and Diesel-Powered Light-Duty Trucks

KEY:  CO=carbon monoxide; CVS = constant volume sampler; GVWR=gross vehicle weight rating; HC=hydrocarbons; LVW=loaded vehicle weight; NMHC=nonmethane hydrocarbons; NMOG= nonmethane organic gases; NOx=nitrogen oxides. 

^a Light-duty truck categories LDT1-LDT4 were not  created until 1994.  From 1968 to 1978, all trucks with a GVWR up to 6,000 pounds were classified as light-duty trucks and were required to meet the same standards.  As of 1979, the maximum weight was raised to 8,500 pounds GVWR.  During 1988-93, light duty trucks were divided...

Federal Exhaust Emission Certification Standards for Newly Manufactured Gasoline- and Diesel-Powered Light-Duty Vehicles

KEY: CO = carbon monoxide; CVS = constant volume sampler; HC = hydrocarbons; NMHC = non-methane hydrocarbons; NMOG = nonmethane organic gases; NOx = nitrogen oxides.

^a The test procedure for measuring exhaust emissions has changed several times over the course of vehicle emissions regulations.  The 7-mode procedure was used through model year 1971 and was replaced by the CVS-72 procedure beginning in model year 1972.  The CVS-75 procedure became the test procedure as of model year 1975.  While it may appear that the total HC and CO standards were relaxed in...

Annual Wasted Fuel Per Person

KEY: NA = not applicable; R = revised.

Very large urban areas - over 3 million population.

Large urban areas - over 1 million and less than 3 million population.

Medium urban areas - over 500,000 and less than 1 million population.

Small urban areas - less than 500,000 population.

^a Percent changes were calculated using the numbers in this table and were not obtained from the source. Ranks are based on the calculated percent changes with the highest number corresponding to a rank of 1.

Amtrak Fuel Consumption and Travel (Metric)

KEY:  kWh = kilowatt hour; R = revised; U = data are not available.

Class I Rail Freight Fuel Consumption and Travel (Metric)

KEY:  N = data do not exist; U = data are unavailable.

^a For 1960-80, the total includes a small number of steam and electric units, which are not included in the per locomotive fuel consumption figure.

^b Includes cars owned by Class I railroads, other railroads, car companies, and shippers.

^c Based on the distance run between terminals and / or stations; does not include yard or passenger train-kilometers.

^d Excludes passenger and work trains.

Transit Industry Electric Power and Primary Energy Consumption and Travel (Metric)

KEY:  kJ = kilojoule; N = data do not exist.

^a  Prior to 1984, excludes commuter rail, automated guideway, urban ferryboat, demand responsive vehicles, and most rural and smaller systems.

^b 1960 to 1991 data include propane. Series not continuous between 1991 and 1992. 1992 to 1995 data include propane, liquefied natural gas, bio/soy fuel, biodiesel, hydrogen, methanol and ethanol, except compressed natural gas. 1996 to 2001 data include only propane, liquefied natural gas, methanol and ethanol. 2002 to 2012 data include the...

Bus Fuel Consumption and Travel (metric)

Combination Truck Fuel Consumption and Travel (metric)

Single-Unit 2-Axle 6-Tire or More Truck Fuel Consumption and Travel (metric)

^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.