Half-Fiend / Celestial Spell-Like Abilities?

[Dragonborn3]

How are the spell-like abilities of a Half-Fiendish/Half-Celestial determined? It says they get them based of of their HD, but there is no mention of using racial or class HD for this.

[Are]

You use the total number of HD (racial + class) for the creature with the template.

[Captain Sir Hexen Ineptus]

Generally you use the racial hit dice only unless specified other wise. I would love to see a quote to otherwise though, as I could be wrong.

[Dragonborn3]

Well, HeroLab has it going off of both. I got the same thing for a 3rd level human Cleric as a Bugbear without any class levels.

But I'd prefer an answer form other people, instead of a computer program.

Does the usage of both/either Racial and/or Class HD seem to make the Half-Fiend stronger?

[Are]

Published Half-Fiends from 3.5 adventures always had it going off both racial and class HD, so it should still be like that.

Edit: Actually, not just the ones from adventures. The example Half-Fiend in the Monster Manual gets spell-like abilities, and it has no racial HD.