Is it possible to get an accurate MPG statistic in an 2001 Toyota Corolla (USA) over OBD-II?

from what I've been able to find out, it's possible to measure (but not reliably) in all OBD-II cars, but that some cars have commands that return the fuel economy in a reliable method.

I have not been able to find any conclusive information on the topic pointing in either direction for the Corolla.