I keep records on an Excel spread sheet.
Since January 1, 2010 I have traveled 20082.00 miles and have purchased 931.096 gallons of fuel.
The average over 9+months is 21.568 MPG. This includes a Highway and City driving, obviously much more highway than city.
Highest was 26.06 MPG and lowest was 16.15MPG.
Greatest quantity of gas in one fill-up = 20.671 after 513.8 miles 24.86 MPG
This is averaged over 66 entries into the spread sheet and includes every weather condition imaginable (snow, rain, head wind, tail wind, 110+ heat and <10).
No jack rabbit starts, always anticipate stops and traffic slow ups, shift to neutral at stop lights.
2009 Edge now has 39135.7 miles on the tracker.

I'm trying to wear this one out so I can get one with the 3.5 EcoBoost.