Mpg seems really low...
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Lead Driver
Joined: Nov 2012
Posts: 8,304
Likes: 28
From: Salem, VA
Mpg seems really low...
I'm getting about 5.5 around town and don't ever hit the highway. I usually drive about 35-45 and very few stop lights if I even hit them. Seems really low, but then again what do I know... Should I save up for a tuner or is that not going to do enough economy wise to ever pay for itself?
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Lead Driver
Joined: Nov 2012
Posts: 8,304
Likes: 28
From: Salem, VA
Have nothing better to do and noticed a huge difference when I did the throttle body on the 5.4 so heck yeah!!! Should have thought about that myself, it's just gone down so fast I wasn't sure wth was up. I'll get on it in the morning 
Cargo Master
Joined: Jun 2010
Posts: 2,113
Likes: 4
From: Iowa
The V10 isn't a economy engine but 5.5mpg isn't what I would consider normal and I very much doubt a tuner would change it much. Cleaning the MAF sensor is a good place to start and it wouldn't hurt to run a tank worth of fuel injector cleaner (use enough for your larger tank) to make sure the injectors are misting fuel in and not just squirting fuel.
Both Dad's 00 and my 06 Super Duty V10's will average a whopping 13+mpg at 65mph hyw but our normal farm short trips on gravel roads (mostly 1 mile trips loaded and unloaded or towing wagons and such) we both average around 7-9mpg. Dad's old 91 Chevy 2500 and my old 94 f150 (that put Dad's supposedly bigger Chevy truck to shame in every way possible) both got about the same MPG's doing the same work, the V10's Play with the same loads and trips we do versus our old trucks.
Both Dad's 00 and my 06 Super Duty V10's will average a whopping 13+mpg at 65mph hyw but our normal farm short trips on gravel roads (mostly 1 mile trips loaded and unloaded or towing wagons and such) we both average around 7-9mpg. Dad's old 91 Chevy 2500 and my old 94 f150 (that put Dad's supposedly bigger Chevy truck to shame in every way possible) both got about the same MPG's doing the same work, the V10's Play with the same loads and trips we do versus our old trucks.
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Lead Driver
Joined: Nov 2012
Posts: 8,304
Likes: 28
From: Salem, VA
When I first got it I could have sworn I was in the double digits and I just want to get back to that. I'll toss some injector cleaner in there and change the fuel filter tomorrow.
Posting Guru
Joined: Aug 2012
Posts: 1,678
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From: Central Tx.
I'm getting about 5.5 around town and don't ever hit the highway. I usually drive about 35-45 and very few stop lights if I even hit them. Seems really low, but then again what do I know... Should I save up for a tuner or is that not going to do enough economy wise to ever pay for itself?
Please add your bank account information to your profile so as we may all bask in your glory
The V-10 X (at least my 3 ) sucks fuel like mad under similar conditions. 5-6 MPG putting around the property. NO STOP LIGHTS, just tooling around, 5-35 MPH, some idling BUT not a lot. It will pick up to there normal 9-10 MPG
in mixed use 
Did the 5.4 do much better ?? Was it 4x4 ??
Cargo Master
Joined: Oct 2006
Posts: 2,097
Likes: 5
From: chicago northwest suburbs
When I was doing my 3 mile round trip commute to work I was getting 7mpg in the winter. With your driving 5.5 seems very low! In town driving mileage will actually increase with 4.30's because the engine doesn't work as hard to get the X moving. You should be seeing closer to 9 with your driving. Unless you are driving it like you stole it! Hen he mileage will be way less!
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Posting Guru
Joined: May 2012
Posts: 1,758
Likes: 3
From: Colorado
I'm getting about 5.5 around town and don't ever hit the highway. I usually drive about 35-45 and very few stop lights if I even hit them. Seems really low, but then again what do I know... Should I save up for a tuner or is that not going to do enough economy wise to ever pay for itself?
I suggest to hook up an obd2 scanner. If you have android get torque pro.
Check the O2 long term fuel trims. Ideally close to 0 but anything over 7% means there is something wrong.
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Posting Guru
Joined: Aug 2012
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From: Central Tx.
( oh yea BOTH are 2000s) 
Post Fiend
Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
That's funny... my Lie-o-meter is exactly that. I checked it when I first got the truck (after resetting it) and it was about 3 mpg off. I've pretty much ignored it since. It's amusing to watch it get really confused when I fill up with shutting the truck off though.
Laughing Gas
Joined: Jul 2010
Posts: 1,174
Likes: 2
From: Flat Rock, MI
Mine is very close also, especially when towing. I think extended idle time seems to skew it. If I reset it while driving, for example after filling up and merging onto the Hwy, it's pretty darn close. If I reset and hit stop and go traffic, it will be off.