var addthis_pub="mastersairab"NY Show Preview: GMC Yukon Denali Hybrid with 21MPG .fullpost{display:inline;} GM is adding yet another 'politically correct' full-size SUV with a hybrid powertrain to its model portfolio. The new 2009 GMC Yukon Denali Hybrid will its world debut at the 2009 New York International Auto Show with sales set to commence in May. The