Depreciation of Revenue Earning Equipment and Lease Charges

Depreciation of revenue earning equipment and lease charges includes the following (in millions of dollars):



	Three Months Ended March 31,
	2013			2012
Depreciation of revenue earning equipment	$	573.0		$	531.4
Adjustment of depreciation upon disposal of revenue earning equipment	(1.3		)	(39.4		)
Rents paid for vehicles leased	15.3			23.1
Total	$	587.0		$	515.1

The adjustment of depreciation upon disposal of revenue earning equipment for the three months ended March 31, 2013 and 2012, included net losses of $3.3 million and net gains of $34.9 million, respectively, on the disposal of vehicles used in our car rental operations and gains of $4.6 million and $4.5 million, respectively, on the disposal of industrial and construction equipment used in our equipment rental operations.

Depreciation rates are reviewed on a quarterly basis based on management's routine review of present and estimated future market conditions and their effect on residual values at the time of disposal. During the three months ended March 31, 2013, depreciation rates being used to compute the provision for depreciation of revenue earning equipment were adjusted on certain vehicles in our car rental operations to reflect changes in the estimated residual values to be realized when revenue earning equipment is sold. These depreciation rate changes resulted in net decreases of $0.7 million and $0.2 million in depreciation expense for the three months ended March 31, 2013 and March 31, 2012, respectively. For the three months ended March 31, 2013, the depreciation rate changes in certain of our equipment rental operations resulted in an increase of $0.1 million in depreciation expense.