I was considering selling my car 6 months ago, so I checked the KBB used car private party price/value, and it was around $12,500. That same report today says i

I was considering selling my car 6 months ago, so I checked the KBB used car private party price/value, and it was around $12,500. That same report today says it is $15,500. (6 year old hatchback with top trim, very low mileage.)