06 lariat 5.4l, 4x4- 183k miles, timing has been done, stock size wheels
11-12 city
14-15 highway

 

5.4 3v
3.73
5" of lift
35" AT on 20" rims
5.5k miles on remanufactured AER/Powersource
Run 87 octane 99% of the time

+/- 13.8 Hwy at 80 mph
+/- 11.5 City

 

13.8 at 80 is terrible. Though, I imagine its because of those tires.

 

Lifted 5" doesn't help....😉

I'm going to replace all the injectors shortly.... They are all original and have 275k on them..... Been getting occasional misfires that I can't feel, but, torque Pro shows they are happening..... Has to be the injectors as everything else is brand new..... Should increase mpg a bit....

 

My 05 Lariat Screw 4x4 averaged 13 MPG's almost all the time. Best tank I ever got was 18 but that was rare.

 

I get about 17 on the hwy, 13 city and towing on hwy.

2005 King Ranch
5.4 Litre 4X4
Full Size 4 Door

 

have you regeared your truck?

 

@DarrinT04 I got 8.7MPG once with my stock size tires and 3.55 rear end. Sounds like he might have regeared it.

 

I average 15mpg. 6" lift and 35s

 

Filled up my '08 4.6 4wd last night, calculated at 16.9 mpg, combined