proplists vs. dicts memory usage

[Sean Cribbs]

Is there information somewhere on the memory requirements of proplists 
vs. dicts for small numbers of keys (< 100)?  If not, is there a nice 
way to measure memory usage at runtime?  I'm trying to determine whether 
switching from a dict to a proplist will save space.

If the difference is negligible, I'll have to figure out some other 
solution (I'm guessing this is the answer).

Cheers,

Sean Cribbs