The most striking similarity between the truth movement and the peak oil movement, to me, is how the believers explain skepticism. For example,
this recent post and its comments thread, on one of the more interesting peak oil blogs
The Archdruid Report, discusses the question of why the public, skeptics, and experts are so blind to the crisis and only the enlightened fringe can see the obvious truth.
The Archdruid's answer delves into centuries of philosophical thought to explore the importance of initiation experiences in overcoming supposed pernicious social influences that can distort one's perception of reality. The post and its comments thread contain vivid and sometimes touching accounts of various commenters' own initiation experiences (reading a book or essay, viewing a video) that opened their eyes to the truth, that changed their entire perception of the nature of the world. Now that their eyes are open, they see others remaining strangely blind to the obvious, just as they themselves had been prior to their own "initiations." This has caused feelings of isolation, strained family relations, and frustration at slow progress in awakening the blinded-by-ideology/TV-tranquilized/distracted masses. Some express the hope that the inevitable next crisis will help wake more people up faster.
The degree of erudition in that blog post, applied to discussion of what are clearly the exact same "wake up the sheeple" and "brainwashed by Fox News" canards familiar to every skeptic who's ever conversed with Truthers, seems almost surreal (at least, I found it so). But apart from that, the similarity is striking. I highly recommend reading the entire essay and its comments thread (even though, yes, it was posted by a druid).