I sell cars, wen you drive your vehicle of the lott it looses 25% of the price you paid for it, after that is 34 cents per mile. Miles and age have a huge factor in the trade in value. Also any thats not stock on the car its gonna hurt the value. The best thing is to sell private, but then you have strange people going to your house and wanting to drive your car, plus usually someone does not have cash so they have to get financed, but usually the private sell value is about 1,500$ more than trade inn so its not a huge difference