X0303 4/A 2009-01-06 2009-01-13 1 0001260828 RIO VISTA ENERGY PARTNERS LP RVEP 0001384121 Cushing MLP Opportunity Fund I, LP 3300 OAK LAWN AVE., SUITE 650 DALLAS TX 75219 0 0 1 0 Common Units 2009-01-06 4 S 0 30849 3.1491 D 424385 D Common Units 2009-01-07 4 S 0 124702 3.0574 D 299683 D Common Units 2009-01-08 4 S 0 35236 2.5037 D 264447 D The filing of this Form 4 shall not be construed as an admission that The Cushing MLP Opportunity Fund I, LP ("Opportunity Fund") is or was for the purposes of Section 16(a) of the Securities Exchange Act of 1934, as amended, the beneficial owner of any of the common units of Rio Vista Energy Partners, LP ("Common Units") held by Opportunity Fund. Pursuant to Rule 16a-1, Opportunity Fund disclaims such beneficial ownership. The Form 4 filed on January 13, 2009 is hereby amended and restated in its entirety solely for the purpose of checking the exit box on the first page. /s/ Jerry V. Swank, Manager of Swank Capital, L.L.C., G.P. of Swank Energy Income Advisors, L.P., Member of Carbon County GP I, L.L.C., G.P. of Carbon County Partners I, L.P., G.P. of The Cushing MLP Opportunity Fund I, L.P. 2009-01-20