I can give you a good idea.I bought a 2013 SS/RS msrp of 42750 I paid 40000 put 1800 miles on it in one year and got tired of the piece of junk and traded it for a 2014 Silverado,the dealer,same one I bought the car from gave me 33000 so in one year not including the taxes paid a 7000 dollar loss almost 20% so that 20% rule is just about spot on.
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