12k in 9 months. Usually averaging around 18-19mpg on interstate, 20-21 when keeping it 65mph and less and about 16mpg with more city driving (though I am not complaining one bit my old F150 only reached 16mpg once the whole time I had it). I personally think it drives better and gets mpg now then when it was new. Over all I love the truck and only issue to date was needing the Sync computer replaced after it decided to completely stop working.
-2011 FX4 Eco CrewCab Black w/black leather, 3.73 EL, Back up cam/sensors, remote start, tow package, trailer brakes, power rear window, plasti dipped emblems/mirror reflectors, matching front tint, 2 12" JL1 subs, soon to add 2" leveling kit from www.F150Lifts.com