Gasoline Price-Gouging Act of 2005 - States that it is unlawful for a commercial vendor to sell either gasoline or diesel fuel at a price that is a 10% or greater increase from the average price prevailing in an area prior to its having been declared or designated as a major disaster area.
Excepts from such prohibition a fuel price that is: (1) attributable to a reasonable additional cost incurred attendant to a major disaster; or (2) consistent with national or international market trends.
Makes such prohibition applicable for 90 days after a declaration or designation is made.
Grants the Federal Trade Commission (FTC) enforcement powers to treat violation of this prohibition as an unfair or deceptive act or practice.
Requires the FTC, within five days following a declaration of a major disaster, to post on its Internet website the average price of gasoline and diesel fuel in such area for the 30-day period preceding the declaration.