"instant market value"
check out this link, it's been asked many times. http://www.cargurus.com/Cars/Discussion-t38914_ds517220
From Cargurus Home......Instant Market Value is the estimated fair retail price for a vehicle based on similar listings in the market. We analyze millions of currently listed and recently sold cars to determine the Instant Market Value for a vehicle based on year, vehicle condition, trim, mileage, transmission, options, region and other factors.
The evaluation is some kind of average of every car listed including salvage, flood, rust states etc and it is total nonsense.