General Motors Co. more than doubled the size of a recall, to 1.6 million vehicles world-wide, after consumer complaints pushed the company to expand a replacement of faulty ignition switches to additional models. On Tuesday, GM said the recall would include 2003 to 2007 model year Saturn Ions, 2006 to 2007 Chevrolet HHRs, and 2006 to 2007 Pontiac Solstice and Saturn Sky vehicles.