The 2009 GMC Yukon XL 2500 is available as a 4-door, 9-seat sport utility. Starting at $45,685, the 2009 GMC Yukon XL 2500 SLE1 w/3SA 4x4 is powered by a 6.0L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated The top of the line 2009GMCYukon XL 2500Commercial Fleet 4x4 , priced at $ 45,485 , is powered by a 6.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated