P-series
P-series fuels are new fuels that are now classified as an alternative fuel. In 1999, the U.S. Department of Energy finalized an amendment to the Energy Policy Act of 1992 that added certain blends of methyltetrahydrofuron (MeTHF), ethanol, and light hydrocarbons to the list of approved "alternative fuels”. These formulations have come to be known under the registered trademark, "P-series". The fuels contain at least 60 percent non-petroleum energy content derived from MTHF (manufactured solely from biomass feedstocks) and ethanol.
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