For those attempting to point blame where none exists, it should be noted that this was the result of "Growth Energy" and 54 other
ethanol producers who petitioned the EPA to
allow the introduction of E15. The first paragraph of the executive summery (Federal Register Volume 75-68095 November 4, 2010):
Quote:
I. Executive Summary
In March 2009, Growth Energy and 54 ethanol manufacturers petitioned the Environmental Protection Agency (``EPA'' or ``The Agency'') to allow the introduction into commerce of up to 15 volume percent (vol%) ethanol in gasoline. In April 2009, EPA sought public comment on the Growth Energy petition and subsequently received about 78,000 comments. Prior to today's action, ethanol was limited to 10 vol% in motor vehicle gasoline (E10).
And since ethanol has a significantly lower BTU/lb than gasoline, it requires more fuel for the same amount of energy 
Cheers,
Brad