Who said proofreading doesn't matter? 

It was a typo that, if true, would've legally required government agencies to stop using regular gasoline in their vehicle fleets by 2020.

The Feb. 25 issue of Federal Times reported that a typo in the 2007 Energy Independence and Security Act called for government agencies to "reduce petroleum consumption by 20 percent by 2015" and "another 20 percent" for each year after 2015. That was in addition to increasing alternative fuels use by 10 percent each year. Except that wasn't correct. A zero was "mistake[nly]" added, unintentionally turning the "2 percent annually after 2015" into "20 percent annually after 2015."