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