110-58, c) Energy Independence and Security Act fra 2007 (P.L. 110-140, H.R.6) om ændring og udvidelse af Renewable Fuels Standard (RFS), som kræver et forbrug på 9 mia. gallons fornyelige brændstoffer i 2008 og 13,9 mia. gallons i 2011, d) faktablade udstedt af US Department of Energy i henhold til Clean cities actions, osv.
109-58; (c) the Energy Independence and Security Act of 2007 (P.L. 110-140, H.R.6) which amended and increased the Renewable Fuels Standard (RFS) requiring 9 billion gallons of renewable fuels use in 2008 and 13,9 billion gallons in 2011; (d) fact sheets issued by the US Department of Energy under the Clean cities actions etc.