I plugged in my numbers using .015 for Crr and .8 as drivetrain efficiency and the mpg numbers matched what I've been seeing on the instantaneous readout from my tripminder.
Now to see which metric returns the biggest difference in mpg with the least amount of change!
'99 Crown Victoria
'97 Impreza 2.2, 5-speed
'98 Impreza Outback Sport 2.2, 5-speed
'05 Outback 3.0R (wife's)