You need to read the entire study at:
http://www.nrc-cnrc.gc.ca/obj/irc/do.../nrcc38443.pdf

yes anyone interested in this subject should read that...

and take note that the study system had the blower running 100% of
the time. When the furnace was not heating, the blower ran for
circulation. and the ECM motor ran much sloer in circ mode compared
to the standard blower so there was much less circulation and not
surprisingly less energy was used.

But if you turn the blower OFF when the furnace is off like most real
people do, then it is less relevant.

and also note the part where the ECM blower caused gas consumption to
increase..

I would say the facts are presented in this paper but the writer
slanted the conclusion in favor of the ECM.

Follow the money...

Mark