RVEP Rio Vista Energy Partners L.P. (MM)

Rio Vista (NASDAQ:RVEP), today announced it has retained Strategic Growth International, Inc. (�SGI�), as its investor relations consultant specializing in creating interest in undiscovered public companies worldwide. Rio Vista is a fast growing energy services master limited partnership, which currently owns certain leasehold interests of oil and gas producing properties and associated pipeline gathering systems in East Central Oklahoma. Rio Vista is also engaged in liquid bulk storage, transloading and transportation of chemicals and petroleum products through its assets and operations in Hopewell, Virginia and Johnson City, Tennessee. Founded in 1989, SGI is headed by Stanley Altschuler and Richard Cooper, two highly respected Wall Street veterans, who have assembled an experienced team of financial professionals that are experts in assisting emerging companies to create worldwide exposure. Since its inception in 1989, Strategic Growth has achieved an unparalleled level of excellence and success, particularly in the energy and oil and gas industries. Douglas Manner, Rio Vista�s Chairman, stated, �We are excited to be working with Strategic Growth International. SGI�s assistance will be invaluable in introducing Rio Vista to institutional investors and generating worldwide market exposure.� ABOUT RIO VISTA ENERGY PARTNERS L.P.: Rio Vista Energy Partners L.P. (NASDAQ:RVEP) is a publicly traded master limited partnership focusing on exploration and production of natural gas, with 65 miles of pipelines and gathering systems in Oklahoma, as well as terminal and transportation operations in Tennessee and Virginia. SAFE HARBOR STATEMENT: Certain of the statements in this news release are forward-looking statements, including statements regarding Rio Vista's retention of Strategic Growth International, Inc. and their ability to introduce Rio Vista to institutional investors and generating worldwide market exposure. Additional information regarding risks affecting Rio Vista's business may be found in Rio Vista's most recent reports on Form 8-K, Form 10-Q and Form 10-K and its registration statement on Form S-3 filed during February 2008 and in Penn Octane Corporation's most recent reports on Form 8-K, Form 10 Q and Form 10-K filed with the Securities and Exchange Commission.