Moral dilemma/car dealership help? (a little long)

[The Dude]

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I looked up the difference in blue book values for a mazda 6 (i have no idea if that's what he had but it should provide a reference) for 04 and 03 and 30k miles. The difference in price was ~12%

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And I'm sure it'd be even less if you take an '04 in January and compare it to an '04 in July.

Sorry, guy. You lied to me about the drop in value, basically trying to get me to pay the whole thing. You lose.