Columbia subject headings:
Automobiles--Fuel consumption--Standards--United States.
Motor vehicles--Fuel consumption--Standards--United States.
Transportation--Energy conservation--United States.
Harvard subject headings:
Automobiles--Fuel consumption--Standards--United States
Motor vehicles--Fuel consumption--Standards--United States.
Transportation--Energy conservation--United States.
Princeton subject headings:
Automobiles--Fuel consumption--Standards--United States.
Motor vehicles--Fuel consumption--Standards--United States.
Transportation--Energy conservation--United States.