Do all familiars grant their masters improved evasion, or is this an ability possessed only by the familiar itself? I ask because the text on page 13 of Tome and Blood seems to say that familiars grant improved evasion.
No familiar in the Player’s Handbook or in Tome and Blood grants improved evasion (though they all have it). You've been misled by an error in the granted abilities text that appears on pages 13 and 14, which should read:
Granted Abilities: All familiars grant their master the benefits of the Alertness feat (when the familiar is within 5 feet), empathic link, and shared spells at 1st level in addition to any special abilities listed above.