Trade-in prices are vague because you have to let us know how much over invoice your paying on the car you're buying brand new.
I go by how much I can buy a brand new 370z for via USAA with no haggling. That sets the price of the value of used cars for me. If I can get a base + sports for a little under $30k, then I have to see at least $4000 in savings from buying used or else it's just not worth it.
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