savagecanuck

1300 kms on my 157" WB 4x4 crew 5.0 3.73 averaging 18.7l/100kms.Not great but no worse than my 14 silverado.So far I have towed my 600lb TT 350 kms and another 300km is towing my work trailer.Yes real world my truck tows and mostly city so I get crappy mileage .Not concerned its a truck and spends very little time empty on the HWY,thats what my wifes SUV is for.

Ghosthex

My 2015 Supercab 5 litre is averaging 17.3 US mpg with 3300 km on it with a 3.55 rear end.

platinum99

1800km on mine 3.5 eco 4x4 with 3.55 axle 14l/100km so far mixed driving

countrysquire

7800 miles now and it has seemed to settle in at 19.3 - 19.5 on every tank. Platinum with 302 & 3.55.

AggieEvan08

I just ran the math (I'm an engineer it's what I do), and my break even point compared to my '12 FX50 is about 15.25 mpg average. If I do better than that then I am spending less on gas (since the Infiniti took premium and averaged 17.8 mpg).

Ordered a 5.0 with the 3.55 4x4 SuperCrew.

Caper3x

Interesting, 1200km with 3.31 axle and I have the same. I sit at 13.8l/100km @ 120km/hr highway

Chrisbert

High 14.x on 2015 3.5EB 4WD KR with 1400 miles.

Bulabula

City, highway or combination, have yet to get above high 14 mpg on a tank.

Bandito

My SuperCrew King Ranch with the 3.5L EcoBoost and a 3.55 rear end at 11,500 miles is now giving me 18.5 mpg (18.0 when calculated via the gas pump's readings). This is on a 35 mile commute that is mostly freeway. I set the cruise control at 72 mph and let it go. This is also with fuel that is 10% ethanol, so I'm pretty happy with it. My previous 2012 SuperCrew Lariat with the 3.5L EB was about 16.5-17.0, so it's a definite improvement.

With both trucks, I saw a slow but steady improvement in mileage up through about 6,000-7,000 miles.

Popsorama

5.0 screw , 1100 miles, 18.3 combo mpg, reset about 500 miles. It keeps going up. Trip at end of month, will re-replie then.