I am getting 12.8 AVG mile per gal, is the right for a 2000 5.4 motor?
I just purchased a 2000 EB expedition and I am getting 12.9 AVG MPG accoring to the computer read out. The truck has 2 mixed matched Good Year Wranglers on it and a 111,000 miles. I am going to get new tires soon, but I was wondering if the tires will help much in the MPG issue. Also, is my MPG common? I drive mostly on 35 to 55 roads w/o much stop and go. I drive like an old lay and rarely have my foot into the gas.
i've got your truck (mines 2wd, you didn't state yours) and i've been getting about 11mpg lately. but i drive nearly 100% city driving and my trips are usually less than 5 miles, and so the truck is just getting warmed up.
if i drove 35-55 like a grandma and no stop and go i think i'd probably be getting more like 14-16.
tire/inflation
winter blend gas
tune-ups
...
there can be lots of factors. again, do a search with "mpg" and you'll have enough reading for days.
You might try cleaning your MAF (mass air flow) sensor and running some seafoam. I did that along with changing my thermostat (was stuck open and engine wasn't getting up to temp) and resetting the PCM and got a 1.5 mpg increase from my first tank of gas on a 30/70 mix of city/highway. We'll see if it stays that way. Just note that the wires in the MAF are delicate so you should only use either a MAF specific aerosol cleaner or electric contact aerosol cleaner (which i ended up using) if you can't find the MAF cleaner. Either way, the cleaner should leave no residue of any type; sure way to screw it up. There are other ways to get more mileage out of it, i.e. tuner on 93 octance tune or e-fans, but it all depends on how much your willing to pay. I'm going to give royal purple oil a try next time the oil needs to be changed. I'm sure other people will chime in on what has helped them.
That's as good as it gets. You might be able to squeeze another 1mpg out of her with some new plugs and some seafoam treatment, but that's wishful thinking. My '01 averaged around 12 -13 when new.
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2006 F-150 Lariat SuperCrew 5.4L 4x4
Dark Toreador Red
Edge Programmer
Westin Ultimate Bull Bar
AVIC-Z3
Magnaflow Dual Exhaust
Volant CAI
Remote Start/Alarm
Undercover Tonneau
Other Fords:
2006 EB Expedition 5.4L
2001 Eddie Bauer Expedition 5.4L
2002 Mustang Convertible GT 4.6L
Put an egg on the gas pedal and your wifes favorite shirt under it and you might get one or two more but... yep thats about as good as it gets. 6000+ pounds and that Newton guy don't get along to well.
It's all about efficiency. The 2V 5.4L is just terribly inefficient due to the fast burn high swirl combustion chamber. Ford had to use a terribly restrictive intake manifold to build low-end torque for truck use,and this makes the engine spark advance sensitive. Add that to the fast burn chamber,and you've got a situation where you can't get away with running much ignition timing without spark knock. This makes the engine inefficient compared to some others out there,and there's not much you can do about it.
The 4V 5.4L used in the Navigator and Blackwood are much more efficent-the combustion chamber is a slower burn design and the intake manifold is much less restrictive.Ford can do this because the 4V cylinder head does a good job of filling the cylinder at low RPM to build torque without having to manipulate the intake to enhance cylinder fill. My Navigator gets 16.5-17.0 in everyday mixed driving,and on road trips-it's right at 20 mpg.
It's all about efficiency and the ability to feed the engine enough spark advance to keep from downshifting and going into open loop power enrichment. There are other things that can be done to help a 2V, but there are limits to what you can do.
JL
I get 12-14 MPG depending on the mix of stop-and-go vs. highway. Has been pretty consistent since new. I change the oil every 3k and just put in a K&N air filter but haven't seen much impact on fuel economy. The truck does seem a little peppier. Don't think tires will make a big difference, just keep them inflated properly (although oversize tires will definitely reduce economy.)
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1997 Exp EB 4x4 LLS 5.4L (only 103k miles! )
[Stock all the way except for a K&N filter]
Thanks for the cold, hard facts.....I figured this was the deal, but was really wishful thinking. So, it really comes down to maintaining the car to keep me at the 12-13 range. I am doing a OH to FL trip in a week, so I will see how the High way driving is.
Thanks for all the tips...
DAve
Oh, Sears told me I could improve 1 to 2 MPG if I do their fuel system cleaning. Sounds like a pipe dream, but any truth to it?
I get 12-14 MPG depending on the mix of stop-and-go vs. highway. Has been pretty consistent since new. I change the oil every 3k and just put in a K&N air filter but haven't seen much impact on fuel economy. The truck does seem a little peppier. Don't think tires will make a big difference, just keep them inflated properly (although oversize tires will definitely reduce economy.)
Oversized tires (within reason) do not effect economy.Most people just change tires,and never compensate for the larger diameter in the speedometer calibration,so the odometer doesn't show the actual true mileage,and the vehicle appears to use more fuel.
Now,if you go to a 200+ lb off-road tire/wheel assembly with alot of drag compared to a street tire,then yes,the rotating mass will effect economy. But,the typical upsize to fill the wheelwells won't do it.
JL
Thanks for the cold, hard facts.....I figured this was the deal, but was really wishful thinking. So, it really comes down to maintaining the car to keep me at the 12-13 range. I am doing a OH to FL trip in a week, so I will see how the High way driving is.
Thanks for all the tips...
DAve
Oh, Sears told me I could improve 1 to 2 MPG if I do their fuel system cleaning. Sounds like a pipe dream, but any truth to it?
Unless I have an exception to the rule but I get around 13-14 around town. Not city, smaller community, and average anywhere from 14-16 on the highway in the cold Canadian winter and 16-18 in summer. I have a K&N and keep my speed at 65-70 mph. I have the overhead mpg guage and have checked it against my calculations and it's pretty close so I take it as gospal. I've seen as high as 22 mpg on the highway with a good tail wind.
I find if I don't reset the overhead mpg gauge it doesn't really move much if I do some town driving and then highway driving so I reset it before every extended highway trip. Also maybe try disconnecting the battery to reset the computer if you haven't done this already because the computer will calibrate settings based on driving. eg. if the previous owner had a lead foot. ( someone please correct me if I'm wrong )
Just some suggestions. Good luck!
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Quote:
Originally Posted by BLK94F150
It's an internet forum, get used to it. It's like having a drunk conversation with every single person in the bar minus the "I love you man".
I have tried everything possible for the last 12 months and my 2000 5.4 gets 11.9 to 12.5 depending on outside temp, maybe defroster? I went up to 285/70/17 tires that are somewhat aggressive for an all terrain and noticed no difference in mpg. Best mpg on highway trip has been 15 ish. I just decided this is what it costs to drive the expi, I cant seem to ease any more out of it no matter how I modify my driving style....
I have tried everything possible for the last 12 months and my 2000 5.4 gets 11.9 to 12.5 depending on outside temp, maybe defroster? I went up to 285/70/17 tires that are somewhat aggressive for an all terrain and noticed no difference in mpg. Best mpg on highway trip has been 15 ish. I just decided this is what it costs to drive the expi, I cant seem to ease any more out of it no matter how I modify my driving style....
Well,unless you've made the necessary changes to the EEC,it has no idea that you're running a tire that's 10% larger than OEM. This will throw off you odometer by 10% as well,thus yeliding a lower fuel mileage figure.
JL
JohnnyLangton - how much of your fuel economy (relative term) do you attritbute to you tuner? 15-20mpg is pretty darn good for these vehicles - basically what GMC is currently using to market the new flex fuel yukons etc.
Any other tricks of the trade which has you getting that mileage. I was just reading published specs on the '01 Nav which posted 12/17 as their fuel #'s.
I'm considering looking into a '99 Nav vs Expedition just b/c I like what I am hearing about the 4V 5.4.
Just note that the wires in the MAF are delicate so you should only use either a MAF specific aerosol cleaner or electric contact aerosol cleaner (which i ended up using) if you can't find the MAF cleaner. Either way, the cleaner should leave no residue of any type; sure way to screw it up. There are other ways to get more mileage out of it, i.e. tuner on 93 octance tune or e-fans, but it all depends on how much your willing to pay. I'm going to give royal purple oil a try next time the oil needs to be changed. I'm sure other people will chime in on what has helped them.
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