Rio Vista Energy Partners LP

Ian T. Bothwellwas elected Treasurer of the General Partner effective July 10, 2003.  Effective September 30, 2004, Mr. Bothwell was elected to serve as Chief Financial Officer, Vice President and Assistant Secretary of the General Partner. He was elected Vice President, Treasurer, Chief Financial Officer, and Assistant Secretary of Penn Octane in October 1996. In November 2006, he was appointed acting Chief Executive Officer and Acting President of the General Partner and of Penn Octane. He also served as a director of Penn Octane from March 1997 until July 2004. Since July 1993, Mr. Bothwell has been a principal of Bothwell & Asociados, S.A. de C.V., a Mexican management consulting and financial advisory company that was founded by Mr. Bothwell in 1993 and specializes in financing infrastructure projects in Mexico. From February 1993 through November 1993, Mr. Bothwell was a senior manager with Ruiz, Urquiza y Cia., S.C., the affiliate in Mexico of Arthur Andersen L.L.P., an accounting firm. Mr. Bothwell also serves as Chief Executive Officer of B & A Eco-Holdings, Inc., the company formed to purchase Penn Octane’s CNG assets.

Murray J. Feiwell was elected as a member of the board of managers of the General Partner in August 2004. From 1986 until January 1, 2007, Mr. Feiwell served as President and Chief Executive Officer of Feiwell & Hannoy, P.C., a law firm located in Indianapolis, Indiana, that specializes in general civil practice, bankruptcy and creditors’ rights, real estate and foreclosure, general business and commercial law. From 1997 until January 1, 2007, Mr. Feiwell has also served as President and Chief Executive Officer of Statewide Title Company, a title company located in Indianapolis, Indiana. Mr. Feiwell earned a J.D. from the University of Michigan in 1963. Mr. Feiwell retired from the practice of law on January 1, 2007 and no longer owns an interest in the law firm or the title company.

Richard R. Canney was elected as a member of the board of managers of the General Partner in August 2004. Since 1997, Mr. Canney has been employed in the mergers and acquisitions and new ventures division of Shell Oil Company in Houston, Texas. Prior to joining Shell, Mr. Canney was a Director and Managing Partner of Corporacion Mercantil Internacional, S.A. de C.V. in Mexico City. From 1994 to 1996, Mr. Canney was a professor of finance at Instituto Tecnologico Autonomo de Mexico in Mexico City. Mr. Canney earned a Masters of Business Administration from the University of Chicago in June 1989. Mr. Canney is also Chairman of the Board of Penn Octane.

Douglas Manner is President and Chief Executive Officer of Westside Energy Corp. He was previously Senior Vice-President and Chief Operating Officer of Kosmos Energy LLC; President and Chief Operating Officer of Whitestone Energy LLC; Chairman and Chief Executive Officer of Bellwether Exploration, and Chief Operating Officer of Gulf Canada Resources Limited. His career began as an Operations Reservoir Engineer at Amoco Production Company where he later became District Manager. In 1981, Mr. Manner joined Ryder Scott Petroleum Engineers as a consulting reservoir engineer. In 1995, as Senior Vice-President, he established a branch office in Calgary . Mr. Manner is a former board member of Resolute Energy Inc. and holds a Bachelor of Science degree (Mechanical Engineering) from Rice University.