Exhibit 10.6


                             MUTUAL GENERAL RELEASE

      KNOW ALL MEN BY THESE PRESENTS: that, for good and valuable consideration,
the receipt and sufficiency of which is hereby acknowledged, Republic Services,
Inc., a Delaware corporation, for itself and on behalf of each of its
subsidiaries and their respective employees, officers, directors, partners,
shareholders, attorneys, agents, employees, subsidiaries, affiliates, insurers,
representatives and assigns (collectively referred to herein as the "Republic
Releasing Parties"), does hereby fully and unconditionally remise, release,
acquit, satisfy and forever discharge GreenMan Technologies, Inc., a Delaware
corporation (the "Company"), and each of the employees, officers, directors,
partners, shareholders, attorneys, agents, employees, subsidiaries, affiliates,
insurers and representatives of the Company (collectively referred to herein as
the "GreenMan Released Parties"), of and from all, and all manner of, action and
actions, cause and causes of actions, suits, debts, dues, sums of money,
accounts, reckonings, bonds, bills, specialties, covenants, contracts,
controversies, agreements, promises, variances, trespasses, damages, judgments,
executions, injuries, claims and demands whatsoever, in law or in equity
(collectively, "Claims"), which the Republic Releasing Parties ever had, and now
have, or may have against the GreenMan Released Parties, whether known or
unknown, for any Claims arising from the beginning of the world to the date
hereof; provided, however, that the Republic Releasing Parties expressly reserve
and do not release any rights of the Republic Releasing Parties against the
Company, which are specifically provided under that certain Promissory Note,
dated of even date herewith bewteen Republic Services of Georgia Limited
Partnership and the Company and having a principal balance of $150,000.00.

      FURTHER KNOW ALL MEN BY THESE PRESENTS: that, for good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged, the
Company, for itself and on behalf of each of its subsidiaries and their
respective employees, officers, directors, partners, shareholders, attorneys,
agents, employees, subsidiaries, affiliates, insurers, representatives and
assigns (collectively referred to herein as the "GreenMan Releasing Parties"),
does hereby fully and unconditionally remise, release, acquit, satisfy and
forever discharge Republic Services, Inc, a Delaware corporation ("Republic
Services"), and each of the employees, officers, directors, partners,
shareholders, attorneys, agents, employees, subsidiaries, affiliates, insurers
and representatives of Republic Services (collectively referred to herein as the
"Republic Released Parties"), of and from all, and all manner of, Claims, which
the GreenMan Releasing Parties ever had, and now have, or may have against the
Republic Released Parties, whether known or unknown, for any Claims arising from
the beginning of the world to the date hereof.

      Each party hereto hereby acknowledges that they read this General Release
carefully and understands its contents, and is aware that this is an agreement
not to sue the other party hereto and constitutes a complete release of
liability by it in favor of the other party as and to the extent provided
herein, and further acknowledge that the undersigned is signing this document of
his/her own free will, with full knowledge of its contents.

                       [Signatures continued on next page]

<PAGE>

      IN WITNESS WHEREOF, this Mutual General Release has been executed by or on
behalf of the parties hereto this 30th day of June, 2006.

GREENMAN TECHNOLOGIES, INC.


By:   /s/ Charles E. Coppa
      ---------------------------------
Its:  Chief Financial Officer
      ---------------------------------


Signed, sealed & delivered in the presence of:


/s/ Heidi J. Maust
----------------------------
Witness


STATE OF    Minnesota
            -----------------
COUNTY OF   Scott
            -----------------


      I HEREBY CERTIFY that on this day, before me, a notary or officer duly
authorized in the State of Minnesota to take acknowledgments, the foregoing
instrument was executed and acknowledged before me by Charles Coppa who is (i)
personally known to me or ["(i)" is circled] (ii) has produced _____N/A____ as
identification.

      Witness my hand and seal in the county and state last aforesaid this 28th
day of June, 2006.


                                 /s/ Rahni F. Bahr
                                 ----------------------------


                                 Notary Public State of Minnesota


                                 Rahni F. Bahr
                                 ----------------------------
                                 Typed, printed or stamped name of notary public

                           [Signatures continued on next page]


                                 [NOTARY SEAL]

<PAGE>

      IN WITNESS WHEREOF, this Mutual General Release has been executed by or on
behalf of the parties hereto this 30th day of June, 2006.

REPUBLIC SERVICES, INC.


By:   /s/ David A. Barclay
      ------------------------------------
Its:  Sr. Vice President & General Counsel
      ------------------------------------


Signed, sealed & delivered in the presence of:


/s/ [Signature illegible]
----------------------------
Witness


STATE OF    Florida
            -----------------
COUNTY OF   Broward
            -----------------


      I HEREBY CERTIFY that on this day, before me, a notary or officer duly
authorized in the State of Florida to take acknowledgments, the foregoing
instrument was executed and acknowledged before me by David A. Barclay who is
(i) personally known to me or (ii) ["(i) personally known to me" is circled] has
produced _____---____ as identification.

      Witness my hand and seal in the county and state last aforesaid this 30th
day of June, 2006.


                                 /s/ Christine M. Doyle
                                 ----------------------------


                                 Notary Public State of Florida


                                 Christine M. Doyle
                                 ----------------------------
                                 Typed, printed or stamped name of notary public



                                 [NOTARY SEAL]