For three decades, James M. Flammang has covered the automobile business - including used cars - as a journalist. During that period, he was the foremost contributor to the annual Used Car Book (and its online equivalent) issued by Consumer Guide, including calculation of average retail values. The author of two dozen books, mostly on auto history but including six titles for children, Flammang has contributed to publications that range from autoMedia.com, Edmunds.com and KBB.com (Kelley Blue Book), to J.D. Power and the Chicago Tribune. For five years, he wrote most of the new-vehicle buying