The API's used to come out at the same time as the DOE's, but they recently moved the API figures to Tuesday evening.
I can't decide whether to pay attention to the API's or not, seeing as they are very rarely the same as the DOE's, based on the fact that submitting volumes you have in storage is voluntary for the API's, but mandatory for the DOE's.
Lots of potential for deliberate misleading if a company has a lot in storage but doesn't disclose it - not suggesting for a minute that this goes on of course!