After you decide to donate a car, tax deduction considerations behoove you to do a little calling around and find a local non-profit organization that can actually use your car as part of it's IRS-approved, charitable mission.

You will find that very few charities conduct their own car sales.
However, educational operations often sell a well-refurbished vehicle at charity auctions.
Such sales often command an price even higher than fair-market value, though you are limited by the extent of your donation rather than what they did to spiffy it up.
Donated cars for tax deductions are certainly not the most lucrative beak on one's tax burden (credits are usually worth about 3 times as much), but they can be very useful.
Get the most out of yours and help some people in your neighborhood.