Yep, about mid 11's, maybe 12 MPG city driving on my (now sold) '99 Expy 4WD, 5.4L.

But oh, how I miss it. And now I'm looking for another one...!

 

Just drove from Salem county NJ to Williamsburg Va a little over 600 miles and I got 16 miles to the gallon on the read out. I only have a K and n filter in the truck it now has 26000 miles in it.

 

1998 expi 5.4(wifes car) worst mileage 7MPG driving fully loaded both a/c's running full blast. But if you really want to drive the expi and are worried about mileage what do y'all think of installing a troyer dual electric fan to replace the 11lb fan and shroud. Or go crazy and get a funny car style fiberglass front clip.(just kidding)

Stu

 

I have on 03, 4.6 with Troyer tunes on an Xcal II (93 performance) + AF1 cold air intake w/ homemade heat sheidl + Royal Purple Moly oil. Best I can get is 16 or a little more in combo driving, mostly highway. Hiway speed is aroundn 65-73. Sometimes my foot is a *little* heavy Hoping to add some efans this year to help a little. I am thinking I need to get used to it

Love the truck though. Haul kids, tools, hunting and shooting stuff, fishing, carpoolers. You name it. Love the ride, steering and the 6 cd changer.

I am so unworthy.

 

you dont buy an expedition if your worried about gas.

 

I am now getting between 16.1 and 16.3 miles to the gallon.. We have the 2006 xlt sport 4x4, The only upgrade is the k/n filter

 

I couldnt help but notice your sig. All I can say is that is one bad A$$ ride you got there!!

To the rest, if you really want to granny the gas, you need something to monitor the fuel rate and display it to you in as close to real time as you can get. I am testing my Scanguage II on my F150 FX4 and once I reach speed, I pull back on the pedal and watch the guage, no problem at all for me to maintain 30 to 35 mpg, but you wont see much at all until you are in at least 3rd and ideally in OD. Granny-ing the gas in 2nd or 1st just wont hardly help ya. I have found that my driving habits are to get up to speed, but not go WOT, but once at desired speed, ease back on the pedal using the mpg readout to find max mpg rate and maintain. Hilly roads are a killer for this as you are lowering your intake and throttle position to lower your available TQ output. Going by feel alone wont help ya, you need feedback from the OBD II port to really see what mpg you can get.

 

I usually get about 11-15mpg. Very stop and go though.

 

I've tracked my Navi's MPG for over 15K miles (since I bought it) and I can say very accurately that it has averaged 14.8 MPG. This is about 60% highway / 40% city. The best thing I have found that saves on gas a bit is keeping your speed down when cruising on the interstate. Going 60mph verrses 85 mph yields about 5 mpg better. But I also think that if you cared much about economy you wouldn't be on this forum!!!

 

Expy is for sale. Screw this ****ty gas milege and lack of *****... GTP it is

 

Your 30 to 35 MPG is when the injectors are off and you are coasting. Push the pedal and down it (MPG) goes.

These vehicles do really well on the freeway and staying in the 60 to 65 MPH range. Go faster and the MPG has trouble against all that wind. Remember consistency works really well.

 

Nope, when I let off the gas entirely and truly coast, I hit between 55 and 60 mpg. I sustain the 30 to 35 mpg when I get the gas pedal just right by watching the throttle position sensor readout. TPS is 16 at true idle, and when I am in OD, and on level roads, I can run with the TPS as low as 17, but ideally about 19. I am also watching the engine load readout. Controlling that one so far is escaping me.

This driving style easily works for city driving, long open hwy driving would kill my ankle without the cruise control which keeps the TPS quite high to handle grades at hwy speeds.

 

Updating. Since I switched over to Chevron/Shell gas, it's gone up to high 13s, low 14s mixed hard city/ highway 85 mph (this is over many fillups.) I do remember that time I went 70 on the highway, and I got 16.6.

Maybe I should try driving granny style for one whole tank, just to see how high I can go

 

Yea, I've tried to granny style it a few times when $ was low, at 1/2 tank I said **** it and drove it like I usually do. than I cut my muffler off and I never find myself letting off the hammer. Just sounds so g00d

 

Update - since I posted above, I've added efans from FAL. They gave me an immediate 1-1.5 mpg increase. Best thus far has been 17.4 mpg mostly (but not all) highway. Better throttle response too.

I am thinking about pulleys to reduce the engine drag a little more. This parasitic loss concept is true.