I agree with Stainlessman
The first interview is like a first date. No one has made a commitment yet.
It's also unlikely that you are dealing with the hiring manager, it's more likely that you are dealing with a representative from HR... who does NOT need you. The hiring manager needs you and the HR rep is the gatekeeper. Get past the gatekeeper to the person who needs you.
After the person who needs you decides they want you (and has budget), then you start your negotiations and ask the hard questions.
If you consider this a waste of time and want all of your answers on the first interview, it's going to be a challenge to get what you want... or a second interview.
