Taking delivery of a new 4.4 tomorrow. I'm trying to figure out the trade in value of my 2000 Expedition E.B. with 37k miles. The Edmunds and Kelly web sites are saying about 25k trade in value. Dealer is quoting 20.5k. Seems that the differance is in the milage. Dealer is saying .25 per mile over 17k. I think it should be .10. Thanks for any Help.