Tax law
You may wish to look at the tax code. I think that it has changed now and you can no longer claim book value as a deduction. Now you can only write off what they actually are able to sell it for from a transaction that is now beyond your control. What if they ebay it (boatangel frequently does) for $3000? From the link below:
In Notice 2005-44, the IRS and Treasury explain rules adopted in the American Jobs Creation Act of 2004, which (1) generally limits the deduction to the actual sales prices of the vehicle when sold by the donee charity, and (2) requires donors to get a timely acknowledgment from the charity to claim the deduction.
Donors may claim a deduction of the vehicle's fair market value under the following circumstances:
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The charity makes a significant intervening use of the vehicle, such as using it to deliver meals on wheels.
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The charity makes a material improvement to the vehicle, i.e., major repairs that significantly increase its value and not mere painting or cleaning.
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The charity donates or sells the vehicle to a needy individual at a significantly below-market price, if the transfer furthers the charitable purpose of helping a poor person in need of a means of transportation.