From personal as well as shared experience from several avid "audiobookers", retention is dramatically decreased with audiobooks. Many folks will use audiobook

From personal as well as shared experience from several avid "audiobookers", retention is dramatically decreased with audiobooks. Many folks will use audiobooks while multi-tasking (driving, cleaning) where the brain is partially distracted from absorbing, reflecting on, and internalizing the book contents. I reserve audiobooks for fiction, autobiographies, and other light materials where I'm not learning so much as consuming content.