2015 6.7 fuel mileage
 

As the title says, can any one chime in with real world fuel mileage and what gear ratio.

I have a 2015 f250 Lariat 4x4 with the 3.55 gear, 18" tires, crew cab, short bed, FX4 and camper package. It has almost 7,000 miles on it and it's been averaging 17mpg so far.

What I have noticed is the lie that is the so-called real-time fuel mileage meter in the dash. Its much more mpg friendly until you hit the half tank mark. From there back, the mpg starts quickly ticking down. I tested this yesterday on my way home from work. It hit the half tank mark and all of a sudden, driving the same flat road at the same cruise speed, the meter wouldn't go above the avg line unless I let way off on the peddle. So I stopped and filled her up. Sure enough, the rest of the way home, the mpg number and graph was going up again.

Said another way, on a full tank, starting with 17mpg on the gauge, it will generally rise to 17.3 or 17.4.by he time I hit the half empty take mark. From there on, it will start dropping back down to 16.9 or 17mpg until I fill up again.

Manual calculation after the last fill up from the half tank mark says my mpg was 16.4

My 6.7 is averaging about 15 mpg and that is semi-agressive on the right pedal. Looking forward to deletes soon. DEF regen is not good IMO. 3.55 ELS gears and 34.5 michelins.

My average is 15.5 with 800 miles on the truck so far. Hoping it gets better as time goes on but if not, I guess it's not that big a deal. CCSB 4x4 3.55 ELS 34.5 Michelins