View Poll Results: What's your Approximate average gas mileage with your 4.6/5.4?
19 or more 
2
1.32%
18 MPG
4
2.65%
17 MPG
5
3.31%
16 MPG
11
7.28%
15 MPG
24
15.89%
14 MPG
38
25.17%
13 MPG
31
20.53%
12 MPG
24
15.89%
11 MPG
7
4.64%
Less than 10MPG 
5
3.31%
Voters: 151. You may not vote on this poll
Ultimate MPG Poll
Tuned
Joined: Dec 2003
Posts: 252
Likes: 11
North Carolina to Key West Fl. 98 E.B. 5.4, 4X4, 3.73 gears pulling 16' duel axle enclosed trailer with three Harleys inside. Total of 2100 miles driven on trip. average MPG was 5.4, mostly interstate driving at 75-80 mph. Has anyone ever got less than this ??.
Elder User
Joined: Nov 2002
Posts: 736
Likes: 1
From: Texas, USA
On a 15 hr. 850 mile trip to CO mountains last week we were in a 20 mph headwind all day, plus gradually going up hill from 516 ft. above sea level. Two adults and 200 lbs of luggage, tools,etc. Gas mileage varied from 12 to 14 mpg. On the return trip 0 to light wind, same 87 octane gas, same roads, same cargo and the mileage varied from 15-17 mpg. Going and coming speeds were 75 -85 mph where possible. Stock 5.4, 4x4. Extra exterior lights, antennas, luggage rack, fender flares, window shades, and so on probably lowers mileage a bit. Mileage on truck is now 122K, and doesn't affect performance or mileage one bit.
New User
Joined: Nov 2003
Posts: 16
Likes: 0
From: Atlanta, GA
My 1999 4x4 EB with 5.4L gets 13.5 avg with reqular unleaded. I live in Atlanta and try to avoid rush hour (therefore I have less stop and go driving). Those of us in the burbs have a good 20mi or more trip on the interstate to get intown.
New User
Joined: Dec 2003
Posts: 9
Likes: 0
1998 2wheel EB 5.4, 1500mile trip from Fl to SC, NC, GA and back. Averaged 15.8 3-adults, 1-15yrold, 1-11yrold plus all the crap needed for 5days.
I have owned two Expos, bought the Exby in May, love it.
This site has been great, replace sub woofer with a JL unit and played the IAC valve game.
I have owned two Expos, bought the Exby in May, love it.
This site has been great, replace sub woofer with a JL unit and played the IAC valve game.
New User
Joined: Jan 2004
Posts: 20
Likes: 0
Terrible mileage, makes me regret buying so far...
Just bought a 99 2 weeks ago 4x4 5.4. So far, the mileage has been mostly town, though some highway on the 1st tank, and so far, that first tank was 10.42 mpg and the 2nd was 10.8. I think that's pretty sad for a baby V8 that isn't driven hard, I can pretty much guarntee it never goes above 2500 rpm even at the hardest of driving for my wife and myself. I'm not towing anything either, and our weather has been great, been 50's and 60's all last couple weeks in Missouri here. Anyways, I'm very dissapointed and I'm going to pull the plug on the O2 sensor and see if it can manage to get any worse, if it doesn't I'll replace the sensor and pucker up and hope it gets better. I ran my superchips (PSD model) diagnostic code reader on it which will work on any ford OBDII it says, and it reports back code P1000. Upon looking the code up, it says.... blah blah blah, more driving required LOL! Anyways, I'm not a fan of computer diagnostics as proven here, so I'm gonna go ahead and pull the O2 plug and see what happens. 
Senior User
Joined: Jan 2004
Posts: 128
Likes: 0
From: Fort Carson, Colorado
The Bonz: That's something I would have never thought about...smaller tires raising the RPMs...So that means if you have bigger tires you get better gas mileage? We are looking to upgrade to bigger tires because we have stock tires on the 2000 4X4 5.4L we just bought. We are ranging about 12.5 mpg right now. I just had the oil changed today for the first time and hope that may help a bit. We shall see.
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New User
Joined: Dec 2003
Posts: 22
Likes: 0
MPG and tire size
You can go too big in diameter and it will hurt your mileage if you are lugging the engine so to speak and not turning enough rpm. Lugging it can be hard on bearings, and causes other stress to all components. The tires are just a gear in the system, literally. Larger tires would theoretcally raise your mpg byl owering engine rpm, just don't over do it. I don't know how one would figure it out unless you tried different combo's and tracked your mileage and quit going bigger when mileage dropped. Matching them to your engine characteristics is what we are looking for ultimately.
Bonz
Bonz
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gatormccluskey
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Jun 25, 2011 07:06 PM
