P-series fuels
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P-series fuels are a set of renewable fuels that can substitute for gasoline. It is a mixture of ethanol, methyltetrahydrofuran (MeTHF), pentanes plus, with butane. The formulas can be adjusted for cold weather and for 'premium' blends. Approximately 35% of the blend is or can be created from waste products of other industrial processes. It was created by Dr. Stephen F. Paul of Princeton University. It was patented in 1997, and was approved by the DOE in 1999.
Most flexible fuel vehicles capabale of running on E85 should also be able to handle P-Series fuel.
The projected retail price will be about 10% less than gasoline. As of July 2006, it is not available to the general public.