Not really no. The value of the car doesn't include the tax incentives since it is only a deduction and has no actual cash value. For CA folks, the rebate does have cash value but only for certain people that actually qualify. Further you can't pass that on to another buyer. The price you paid for the car at delivery is the value. If that price drops you lost that much value. I don't consider my $65k P3D to be a $55K car after tax. That's compete bull and a marketing lie.
Now if some buyer thinks they should be paying only $50-55K for a used P3D because you know, we all got those tax incentives, then I'd be laughing my head off at them.