Amends the Internal Revenue Code to: (1) extend through 2012 the alternative motor vehicles tax credit for advanced lean burn technology, hybrid, and new alternative fuel motor vehicles; (2) increase the amounts of such credit; (3) repeal limitations on the number of hybrid and advanced lean-burn technology vehicles eligible for such credit; and (4) deny such credit to a taxpayer whose adjusted gross income exceeds $100,000 ($200,000 in the case of married couples filing jointly).