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

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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RIO VISTA ENERGY PARTNERS L.P.

Common Units

767271109

April 29, 2009

(Date of Event which Requires Filing of this Statement)

o

Rule 13d-1(b)

x

Rule 13d-1(c)

o

Rule 13d-1(d)

1

Names of Reporting Persons.

I.R.S. Identification Nos. of above persons (entities only)

Standard General L.P.

2

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)          o

(b)          x

3

SEC Use Only

4

Citizenship or Place of Organization.

Delaware

Number

of Shares

Beneficially

Owned by

Each

Reporting

Person With

5  Sole Voting Power

0

6  Shared Voting Power

5,006

Refer to Item 4 below.

7  Sole Dispositive Power

0

8  Shared Dispositive Power

5,006

Refer to Item 4 below.

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,006

Refer to Item 4 below.

10

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

11

Percent of Class Represented by Amount in Row (9)

0.2%

Refer to Item 4 below.

12

Type of Reporting Person (See Instructions)

PN

1

Names of Reporting Persons.

I.R.S. Identification Nos. of above persons (entities only)

Standard General Fund L.P.

2

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)          o

(b)          x

3

SEC Use Only

4

Citizenship or Place of Organization.

Delaware

Number

of Shares

Beneficially

Owned by

Each

Reporting

Person With

5  Sole Voting Power

0

6  Shared Voting Power

5,006

Refer to Item 4 below.

7  Sole Dispositive Power

0

8  Shared Dispositive Power

5,006

Refer to Item 4 below.

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,006

Refer to Item 4 below.

10

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

11

Percent of Class Represented by Amount in Row (9)

0.2%

Refer to Item 4 below.

12

Type of Reporting Person (See Instructions)

PN

1

Names of Reporting Persons.

I.R.S. Identification Nos. of above persons (entities only)

Soohyung Kim

2

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)          o

(b)          x

3

SEC Use Only

4

Citizenship or Place of Organization.

United States

Number

of Shares

Beneficially

Owned by

Each

Reporting

Person With

5  Sole Voting Power

0

6  Shared Voting Power

5,006

Refer to Item 4 below.

7  Sole Dispositive Power

0

8  Shared Dispositive Power

5,006

Refer to Item 4 below.

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,006

Refer to Item 4 below.

10

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

11

Percent of Class Represented by Amount in Row (9)

0.2%

Refer to Item 4 below.

12

Type of Reporting Person (See Instructions)

IN

1

Names of Reporting Persons.

I.R.S. Identification Nos. of above persons (entities only)

Nicholas J. Singer

2

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)          o

(b)          x

3

SEC Use Only

4

Citizenship or Place of Organization.

United States

Number

of Shares

Beneficially

Owned by

Each

Reporting

Person With

5  Sole Voting Power

0

6  Shared Voting Power

5,006

Refer to Item 4 below.

7  Sole Dispositive Power

0

8  Shared Dispositive Power

5,006

Refer to Item 4 below.

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,006

Refer to Item 4 below.

10

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

11

Percent of Class Represented by Amount in Row (9)

0.2%

Refer to Item 4 below.

12

Type of Reporting Person (See Instructions)

IN

(a)

Name of Issuer

Rio Vista Energy Partners, L.P. (the “Issuer”)

(b)

Address of Issuer’s Principal Executive Offices

1313 E. Alton Gloor Blvd., Suite J, Brownsville, Texas, 78526

(a)

Name of Person Filing

This statement is filed by: (i) Standard General Fund L.P. (“Standard General Fund”) with respect to common units, representing limited partner interests of the Issuer (the “Units”), of which it is the holder of record; (ii) Standard General L.P. (“Standard General”) with respect to the Units, which it may be deemed to beneficially own pursuant to its investment management agreement with Standard General Fund pursuant to which Standard General has all investment and voting power with respect to securities held by Standard General Fund; (iii) Soohyung Kim (“Mr. Kim”), a co-managing member of Standard General Management LLC, a Delaware limited liability company (“Standard General Management”), which is the managing member of Standard General GP LLC, a Delaware limited liability company, which is in turn the general partner of Standard General Fund, with respect to the Units; and (iv) Nicholas J. Singer (“Mr. Singer”), a co-managing member of Standard General Management, with respect to the Units.

Mr. Kim and Mr. Singer may be deemed to have indirect beneficial ownership of the Units based on the foregoing relationships. In addition, Mr. Kim and Mr. Singer have controlling interests in Standard General S Corp., a Delaware corporation, which is the general partner of Standard General Holdings, L.P., a Delaware limited partnership. Standard General Holdings, L.P. is the general partner of Standard General.

Standard General, Standard General Fund, Mr. Kim and Mr. Singer have entered into a Joint Filing Agreement, a copy of which is incorporated herein by reference as Exhibit 99.1, pursuant to which they have agreed to file this Schedule 13G jointly in accordance with the provisions of Rule 13d-1(k) of the Securities Exchange Act of 1934, as amended.

(b)

Address of Principal Business Office or, if none, Residence

The address of the principal business office of Standard General, Standard General Fund, Mr. Kim and Mr. Singer is 650 Madison Avenue, 26th Floor, New York, NY 10022.

(c)

Citizenship

Standard General and Standard General Fund are Delaware limited partnerships. Mr. Kim and Mr. Singer are United States citizens.

(d)

Title of Class of Securities

Common Units (“Common Units”)

(e)

CUSIP Number

767271109

Item   3.

If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

(a)

o

Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

(b)

o

Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c)

o

Insurance Company as defined in Section 3(a)(19) of the Act

(d)

o

Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).

(e)

o

An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

(f)

o

An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);

(g)

o

A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

(h)

o

A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i)

o

A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j)

o

Group, in accordance with §240.13d-1(b)(1)(ii)(J).

Item   4.

Ownership

1. Standard General L.P.

(a)

Amount Beneficially Owned

5,006

(b)

Percent of Class

0.2%

(c)

Number of shares as to which such person has:

(i)

sole power to vote or to direct the vote

0

(ii)

shared power to vote or to direct the vote

5,006

(iii)

sole power to dispose or to direct the disposition of

0

(iv)

shared power to dispose or to direct the disposition of

5,006

2. Standard General Fund L.P.

(a)

Amount Beneficially Owned

5,006

(b)

Percent of Class

0.2%

(c)

Number of shares as to which such person has:

(i)

sole power to vote or to direct the vote

0

(ii)

shared power to vote or to direct the vote

5,006

(iii)

sole power to dispose or to direct the disposition of

0

(iv)

shared power to dispose or to direct the disposition of

5,006

3. Soohyung Kim

(a)

Amount Beneficially Owned

5,006

(b)

Percent of Class

0.2%

(c)

Number of shares as to which such person has:

(i)

sole power to vote or to direct the vote

0

(ii)

shared power to vote or to direct the vote

5,006

(iii)

sole power to dispose or to direct the disposition of

0

(iv)

shared power to dispose or to direct the disposition of

5,006

4. Nicholas J. Singer

(a)

Amount Beneficially Owned

5,006

(b)

Percent of Class

0.2%

(c)

Number of shares as to which such person has:

(i)

sole power to vote or to direct the vote

0

(ii)

shared power to vote or to direct the vote

5,006

(iii)

sole power to dispose or to direct the disposition of

0

(iv)

shared power to dispose or to direct the disposition of

5,006

Item   5.

Ownership of Five Percent or Less of a Class

Item   6.

Ownership of More than Five Percent on Behalf of Another Person

Item   7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company

Item   8.

Identification and Classification of Members of the Group

Item   9.

Notice of Dissolution of Group

Item   10.

Certification

STANDARD GENERAL L.P.

By: /s/ Scott Cohen

Name: Scott Cohen

Title:

Attorney-in-Fact

STANDARD GENERAL FUND L.P.

By: /s/ Scott Cohen

Name: Scott Cohen

Title:

Attorney-in-Fact

SOOHYUNG KIM

By: /s/ Scott Cohen

Name: Scott Cohen

Title:

Attorney-in-Fact

NICHOLAS J. SINGER

By: /s/ Scott Cohen

Name: Scott Cohen

Title:

Attorney-in-Fact