Academic centers with 'elite' reputation (think US News top 10-15) generally pay poorly (there may be some exceptions such as Mayo), usually in the range of $150-$240 although some may let you make more money covering nights. A major reason for this is that a lot of outpatient revenue is taken by a Dean's tax or fee which can take 10-15% of your revenue, basically negating your profit from clinic. If you are on a research track you will usually be paid less than on a clinical track.
2nd and 3rd tier academic centers which don't utilize this model and have more trouble recruiting pay better (think Kansas, Nebraska, Harvard (joke), Arkansas, etc)
This information is derived from my limited experience interviewing for academic jobs and experiences of co-fellows so I'm sure exceptions exist.