-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 KR4Qtw1fB3Pyxib71KPkGbaq0K+XL8YdW8ZennAUT/B8RvEqWQ5nb+MMrK1G5OqV
 gZMaQr3ZOuA9JRnhfuScZA==

<SEC-DOCUMENT>0000350698-10-000001.txt : 20100104
<SEC-HEADER>0000350698-10-000001.hdr.sgml : 20100101
<ACCEPTANCE-DATETIME>20100104161717
ACCESSION NUMBER:		0000350698-10-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100104
FILED AS OF DATE:		20100104
DATE AS OF CHANGE:		20100104

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BURDICK RICK L
		CENTRAL INDEX KEY:			0001015719

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13107
		FILM NUMBER:		10502545

	MAIL ADDRESS:	
		STREET 1:		110 SE 6TH STREET
		STREET 2:		29TH FLOOR
		CITY:			FORT LAUDERDALE
		STATE:			FL
		ZIP:			33301

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AUTONATION, INC.
		CENTRAL INDEX KEY:			0000350698
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-AUTO DEALERS & GASOLINE STATIONS [5500]
		IRS NUMBER:				731105145
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		200 SW 1ST AVE
		STREET 2:		SUITE 1600
		CITY:			FORT LAUDERDALE
		STATE:			FL
		ZIP:			33301
		BUSINESS PHONE:		9547696000

	MAIL ADDRESS:	
		STREET 1:		200 SW 1ST AVE
		STREET 2:		SUITE 1600
		CITY:			FORT LAUDERDALE
		STATE:			FL
		ZIP:			33301

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AUTONATION, INC. /FL
		DATE OF NAME CHANGE:	20090827

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AutoNation, Inc. /FL
		DATE OF NAME CHANGE:	20090827

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AUTONATION INC /FL
		DATE OF NAME CHANGE:	19990407
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-01-04</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000350698</issuerCik>
        <issuerName>AUTONATION, INC.</issuerName>
        <issuerTradingSymbol>AN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001015719</rptOwnerCik>
            <rptOwnerName>BURDICK RICK L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 SW 1ST AVE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1600</rptOwnerStreet2>
            <rptOwnerCity>FORT LAUDERDALE</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33301</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>19.15</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2010-01-04</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>20000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2010-01-04</value>
            </exerciseDate>
            <expirationDate>
                <value>2020-01-04</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>20000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>20000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The stock option has been granted pursuant to the AutoNation, Inc. 2007 Non-Employee Director Stock Option Plan.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Jonathan P. Ferrando, Attorney-in-Fact</signatureName>
        <signatureDate>2010-01-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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