For Zimbabwe, the denatured ethanol standard (D4806) was adopted to check the quality of ethanol being used for mandatory blending. The denatured ethanol standard is referenced in the Statutory Instrument 17 of 2013. Zimbabwe produces biofuels mainly for energy security, reduction of fuel import bills and environmental protection. The country is currently facing acute foreign exchange shortages and the use of biofuels assists in reducing the fuel import bill. The Tennessee law, for example, directs the adoption of ASTM International standards for engine fuels which has resulted in a remarkable improvement in the uniformity of fuels supplied in the state, with 97 % compliance on all fuels analysed. Peru also referred to the ASTM International standard D6751 in the Supreme Decree DS 021-2007-EM, Regulation for Biofuels Commercialization, because a suitable national standard did not exist.