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2007+ Expedition & Navigator 2007, 2008, 2009 and 2010 Ford Expedition and Lincoln Navigator

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Old 09-13-2009, 05:01 PM
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MPG Question

Any body done any mods to improve gas milage? I get about 18 on the highway 14 or so in town. My wife with the lead foot gets about 12.5 city. I have a 2007 EL 2wd. Had the "clunk" in the transmission when stopping and took it in a couple of weeks ago for the fix and it works great now.
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Old 09-13-2009, 05:04 PM
eddiemoney eddiemoney is offline
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Best things off the shelf you can do is intake, exhaust, and a tune to match everything up.
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Old 09-13-2009, 07:03 PM
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pretty much nothing, but driving it smartly and keeping the maintenance up


you can get it some custom programming for the ECM. Will run you about $500. It will give you way better HP/TQ gains, and you should see MPG gains if you keep your foot out of it.


but $500 for a tiny MPG gain isn't economical...unless of course you want the performance gains, and the MPG's is how you justify it to the wife.
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Old 09-13-2009, 07:05 PM
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btw, even with custom tuning and every bolt-on in the world...we are only talking about maybe a 1 mpg gain. nothing world changing. The Expedition is just too heavy.

conversely, with my Mustang and similar mods, I could see gains of up to 3 MPG and 30-40 HP.

but it also wieghs 1/2 the weight of the Expy, with almost identical HP/TQ values
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Old 09-13-2009, 09:12 PM
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Most guys I am seeing with a 5 star tune are getting 1-2 mpg better. That pays itself off in just a couple years.
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Old 09-15-2009, 10:46 AM
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If you use dyno oil switch to Mobil 1 or Castrol synthetic.I did it in my 04 Jeep Cherokee and gained 2 miles/gallon.

It adds up.
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Old 09-15-2009, 01:15 PM
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Quote:
Originally Posted by eddiemoney View Post
Most guys I am seeing with a 5 star tune are getting 1-2 mpg better. That pays itself off in just a couple years.
What is this? Got a web site?
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Old 09-15-2009, 08:42 PM
eddiemoney eddiemoney is offline
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I am actually in conversation with Mike from 5 star tuning right now looking for support for my 2010. Looks promising.

Just google 5 star tuning, it is the first link. Search around this forum (more so in the F150, super duty sections) and you will find testimonials. I am seeing V10 guys go from 7mpg to 10mpg with just the economy tune.
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Old 09-17-2009, 12:21 AM
benshere benshere is offline
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I have noticed on my 07 EL that it is very important to use a light foot around town. My mileage seems to go down hard when you go too deep in first gear, that 4.17 is just to start the momentum. I would like to see some lockout for first, other than a manual shift for that very light town driving. Even 2nd gear is in the 3's, which is way lower than anyother FoMoCo automatic I have driven in the past. I have tried a 2nd takeoff in easy traffic and it works very well (.02) except it requires manual shifting on up from there. Yes, I am very well aware just how heavy these things are.

I'm thinking (see if anyone else agrees with me) that the enrichment starts at a fairly small drop in manifold vacuum, so the light foot is very important. It was/is hard for me to let the soccer moms in their mini vans (you know the type) go ahead and run on off at the lights.

I have never run the actual numbers for mpg, just used the display, but it seems to me that (for some reason) any prolonged idling makes that avg go to *** in a handbasket. Since the processor does a running average, you wouldn't think idling would have that big an effect, but it seems that way to me. Thats my story and I am stickin to it
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Old 09-17-2009, 12:21 AM
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