Dollar Thrifty Automotive Group Inc. (NYSE:DTG) said Tuesday it will not meet its previous full-year earnings estimates, news that pushed shares down 20%. The car rental company said its 2008 revenue will be down because of difficult operating trends, which have led to lower daily revenues and vehicle depreciation costs. Lower-than-expected earnings for the second quarter are also contributing to this year’s outlook. Dollar Thrifty’s full-year earnings per share will not meet the previous estimate of $1.00 to $1.50, the company said. The Tulsa, Okla.-based company will report second-quarter earnings on Aug. 5.

On Tuesday, Dollar Thrifty Automotive Group's shares were at $7.45, down $2 from Monday’s close. The company’s stock has lost 68.9% since January of this year.

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