2. Governmental Advisory Associates, Inc., 1993-94 Methane Recovery from Landfill Yearbook (New York, NY, 1994).
3. Imports and exports of ethanol were assumed to be equal.
4. Data on fuel alcohol stocks are not available. Consequently, fuel alcohol consumption data presented in this report are based on the assumption that change in fuel alcohol stocks is zero in each year.
5. U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (various issues), Table MF-33GLA, "Monthly Gasohol Reported by States."