U.S. retail gasoline fuel prices are equal to or greater than 4.00 USD/gallon after 01/31/2009 and on or before 12/31/2010. The national average prices, which are aggregate regular grade gasoline (including reformulated) prices across all regions of the U.S. (surveyed and calculated by the Department of Energy), will be used for this claim as the “U.S. retail gasoline fuel prices”. The nominal prices calculated by the DOE will be used in this claim without further adjustments.
Currently, the price information can be accessed online: http://ton to.eia.doe.gov/oog/info/gdu/gasdiesel.asp#
If the Department of Energy changes its methodology in determining the prices, the new DOE modified prices will be used for this claim. If such modification results in changing any of the past prices within the above time frame to be nominally at or above $4.00/gallon, the claim will be judged TRUE.
I will judge this using the DOE's "U.S. regular gasoline prices," permitting any changes to the sampling methodology by the DOE. If, at any time between 01/31/2009 and 12/31/2010, the DOE's "U.S. regular gasoline price" is equal to or greater than $4.00, this claim will be immediately judged TRUE.
If the DOE stops publishing prices under the title "U.S. regular gasoline prices," any price published by the DOE that most closely matches the intent of the earlier calculation will be used.
If the DOE stops publishing any prices, then average prices calculated by a major news organization will be used.
In case of ambiguity I will judge this claim by its intent.