Black Book’s Used Vehicle Retention Index fell to 115.4 in January from116.3 in December.

The Index has now declined two months in a row.

 The Index decline was nearly across-the-board for most segments, with only compact and midsize cars showing modest gains.

There were a number of segments with declines of over 1 percent, including minivan, small pickup, midsize and full-size luxury CUV/SUV, sporty car, subcompact car, near luxury car, and compact crossover SUV.