<prompt> Andika mwendelezo kwa aya hii - Katika FIL Luge Ulaya Mashindano, Gruber alishinda medali tisa na dhahabu mbili Wanaume doubles: 2008, 2014, fedha nne Wanaume doubles: 2004; Mchanganyiko wa timu: 2004, 2006  <response>: , 2013, na shaba tatu waume doubles: 2006; Mchanganyiko wa timu: 2012, 2014. 