i have a 2001 extended cab 4x4 with the 5.4 and 76000 miles i cant seem to get more than 11 miles a gallon and thats driving normal. i was thinking of having it looked at and maybe a tune up. it has a mac cat back and 285/75/16 pro comp xtreme terrain tires and a 2.5 inch lift/leveling kit. i only lost one mile per gallon with the tires. if anyone has a suggestion it would really help thanks

 

WoW LUCKY!!!!! I get around 8 miles to a gallon, but an overall tune up might help your problem probably mine too

 

You'd be surprised what new plugs and wires can do to improve gas mileage and overall performance. Granted they are a PITA to replace they sure do show good results.

 

HAHAHA you mean COP's i dont believe 5.4's have wires but about 8 of these sure would be nice http://www.accel-ignition.com/Produc...minselection=0

 

I think its just the way these trucks are... I have plugs with around 8,000 miles and notice no difference. I have tried quite a few things to improve mileage as well as performance. E-fans, clean K&N filter every 3rd oil change, clean maf, keep tires inflated, diablo sport programmer, tried keeping it under 70mph/2000rpm's, keep windows up. Nothing really works for me, maybe the 02 sensors but ive been told to just wait until you get a code.
Currently getting around 12 right now if I dont get into it.

 

i think i will have a buddy of mine do the plugs he is a ford master tech. then i can worry about my plugs losening up for the next ten thousand miles

 

Just did my O2's and it didn't do SHI!!.... ya you know what i mean

 

i have only had the truck a few months i guess i will have to suck it up

 

Didn't really pay attention to the year, just referencing my plug and wire change in my old 1997.

 

Changing the EGR valve made a huge differance with my milage.

 

i will have my buddy check the egr. thanks i noticed if you drink a twelve pack and squint your eyes my truck really looks like a 07 i just have to figure out how to get it to drive like one!

 

my f-350 v-10 gets 11-12 mpgs. doesn't sound right.

 

it goes to my buddy next tuesday. 230 miles to a full tank sucks i hope he finds something wrong

 

11's all I get.

 

i only get 11 as well. You might try replacing the fuel filter, A clogged fuel filter can do a number on performance.