Found some more information on the tax credit. The minimum credit amount is $2,500, and the credit may be up to $7,500.
A tax credit reduces the total amount of income tax you owe. So, if you owed $10,000 in federal income tax, a $2,000 credit would reduce the amount you owed to $8,000. With a credit, your actual savings would be $2,000.
I normally owe $200 dollars, if I purchase the Mitsubishi Imiev I would save $200.00. The tax credit for buying a electric car is set up for the upper class not the middle class.