According to one of the devs, Mwmbl currently has around 500 million indexed pages (“when I last checked [sic!]”) which is, well, not two times as much as PriEco, but significantly more than it. (I am not trying to discard or not appreciate PriEco’s effort, in fact it is a great project and I think has its own advantages too, I am just comparing two samely unknown, privacy-focused search engines.) PriEco has around 350 million right now.