From what I gather from reading these forums is that TiVo selects the mobile version of a YouTube video. It seems unlikely that good quality HD content would be flagged for mobile usage. With that being said, yes, TiVo should "fix" the selection to not exclusively include mobile flagged content for viewing.TIVO ! Please work with YouTube and make your player select the HD stream (if available) of a Youtube steam. VERY FRUSTRATING !!!
About six months ago PS3 fixed their YouTube app ... so now it selects the HD stream if available.
TIVO Premiere selects the 360p stream ... which is awful on a HDTV.
Until then I am forced to use my PS3 to watch youtube HD streams !