Comprehension/Fallout: New Vegas
With the Comprehension perk, you gain double the bonus from reading magazines and one additional point from skill books.”— In-game description, Fallout: New Vegas
The perk doubles the skill boost provided by magazines (from +10 to +20) and increases the effectiveness of book by 33% (from +3 to +4 skill points). This translates to 52 extra skill points in base New Vegas and 46 in the add-ons. The latter number may vary depending on the luck with Workbench crates in Honest Hearts.