I've been reading Complete Champion and I came across a conflict the in text that I need resolved.
On page 52, in the Domain Feats section, the text reads:
If you have the ability to turn or rebuke undead, you can gain additional daily uses of a domain feat’s benefit by permanently sacrificing daily uses of that ability.
But under the specific feat it uses the word "expend", like you're just using a use/day of Turn Undead.
For example Travel Devotion uses the text:
Special: If you have the ability to turn or rebuke undead you gain one additional daily use of this feat for each two daily turn or rebuke uses you expend.