As a whole GM reported an 8 percent downturn of sales in April, mainly from a decline in fleet sales. Cadillac suffered the worse, showing a 25 percent drop from last year with only 9,851 sales. The discontinuation of the DTS and STS proved the most detrimental, as only 39 DTSes left the lots, a 98 percent dip from last year, and 20 STSes sold, a 97.7 percent fall. 

[via Motor Trend]