In their Publication 4302 and 4303, the IRS notes there are four ways that charities use your car.
Charities that actually put the tire to the road and drive your car in their charitable efforts.
Charities that sell cars that are donated and use the cash to help further their charity.
Charities that hire an agent (for-profit) to run their car donation effort and get a percentage of the sale.
Charities that give permission to independent for-profit companies to encourage donations and charge a fee for the use of their name.
A donation to the last variation on the theme DOES NOT qualify as a tax deduction. Well, how would you know? How can you find out which charity is going to benefit both themselves and your bottom line?