U.S. total = 2.24 gallons

1.99 or below:

Alabama
Arkansas
Kansas
Kentucky
New York
North Carolina
Ohio
Oklahoma
Tennessee
Utah
West Virginia

2.00–2.24:

California
Connecticut
Georgia
Indiana
Iowa
Maryland
Michigan
Mississippi
Pennsylvania
Texas
Virginia

2.25–2.49:

Arizona
Idaho
Illinois
Louisiana
Maine
Minnesota
Missouri
Nebraska
New Jersey
New Mexico
Oregon
Rhode Island
South Carolina
Washington
Wyoming

2.50 or over:

Alaska
Colorado
Delaware
Dist. of Columbia
Florida
Hawaii
Massachusetts
Montana
Nevada
New Hampshire
North Dakota
South Dakota
Vermont
Wisconsin