Difference between Dine on something and Dine out on something

dine on something—have smth. for dinner:

• They dined on mince, as there was nothing else in the house.

dine out on something—gain social success by telling interesting stories:

• You’ll dine out on it for weeks, won’t you, old boy?

Note: Neither expression fully correlates in meaning with the phrase dine off something—

1. = dine on something:

• We dined off onion pilaf, and sponge-cake of maize flour.

2. = dine out on something:

• Ever since his adventure he has been dining off the story.