I have an '07 Supercrew. It is a 5.4L, 4x4 with 3.73's. I dont get that great of mileage (12 around town, and 16 on the highway), and I read about people getting 15 around town and 18 on the highway. They may have a 2wd, but I cant see a 4wd making that big of a difference. I drive easy too, to get the best mileage I can. Is anybody getting this bad of mileage? Lifted trucks are getting better than me with 35's. I know the gearing helps on the highway, but it cant help from a start.

My truck is all stock, except for an edge (which made no difference in mileage) and a flowmaster exhuast. I also have the 20's that are 32" tall.

 

for starters, what kind of city driving do you have? if you are constantly stuck in traffic, thats actually pretty good mileage.

And what speeds do you average on the highway? Ever use cruise?
and what kind of terrain do you see? if you see alot of hills, that could be about right for hwy gas mileage also

and do you know what gear ratio you have from the factory

PS i usually get 13 city and 19-20 hwy out of my 4.6

 

I have the 3.73's for gears. I drive 9 miles on the freeway daily to work. Not much traffic and all flat terrain. Usually I cruise around 70 on average on the highway.

I cant figure out why it is so bad. You think the 9 miles of highway everyday would up my average for around town mileage. When I fill up it always works out to be right around 12. The best being 12.5 mpg.

 

well a nine mile trip, the truck is barely warmed up and everything working smoothly before you shut her down.... Okay i exaggerated some, but you get my point? Its not like youre doing 300 mile highway trip

 

I know what you mean, but it also isnt a 10 mile stop and go traffic light drive. Where I am taking off from a dead stop all the time. In other words, it isnt a full city driving.

 

yah but honestly tho, your truck runs really rich on start up, and runs a little rich while warming up, so even if you had ideal conditions driving the rest of the way for the next 10 miles, you might just barely break even...
-Patrick

 

SO how are these other guys getting a significant difference of mileage than me? Some are at 15 around town. And even on the highway I am 16, and some are around 18.

Highway meaning a 400 mile trip (6.5 hours of driving). Some up and down hill.

 

yeah i only count hwy mileage if im driving atleast 30 minutes. Some of us have 3.55 gears which help on highway efficiency. I try to draft and coast when i can, even when i use cruise. Ive also found that even if its not hot enough it helps to atleast have the panel vents on. And if you are really going on a trip you can put your front tires up to 35 psi to match the rears and help reduce rolling resistance etc.

But in general its one of those things that is different for everyone. gears, tire size/pressure, altitude, humidity, temperature, mods, etc etc there are too many variables that factor in to say there is one right or wrong mileage.

 

That is true....... I just didnt think I would be that far off and never really heard of anybody on the forum getting what i get for mileage. My edge didnt even improve the mileage, and sometime I read 1-2 mpg better from forum members. I guess I just have one of those trucks.

 

Maybe its the ones claiming 18mpg and above that are not being honest.
Seriously I have had my 2004 4x4 Supercrew set up in more formats than most on these boards. From a serious lowering, to its present configuration of being leveled with 35's. When I had it lowered and the stock wheels and tires on it, plus the Troyer custom tuning, Airforce1 intake,andMagnaflow exhaust, I could squeak 18mpg out of it on long highway trips. (I normally cruies at 75-85 when going to Virginia) In its present state of setting leveled (some think I have a lift kit, but in realilty I only have 2" AS leveling) with the 35's on 17x9 rims I am lucky to get 16 mpg on the highway, and about 12-13 in town. Same tuning modifications but the truck is now setting higher and definately pushes more wind at highway speeds.
I will get some flaming for this statement, but if you want to maximize power and gas mileage you truely need Custom tuning which you are not going to get with the Edge..Have seen far too many comparisons to feel any diffently about it.....

 

These are his mods....

2005 F150 Lariat 4X4 Screw
5.4 3V
3.73 LS
Banks Monster Exhaust
2.0 AS
K&N FIPK
Superchip

Same gears, engine, and 4x4...

 

Marc,

I am getting the same mileage as you without the 35's. I dont know what else to do, any more mods to improve gas mileage and I will be spending more on the mods than I save in gas. You think the custom tunes make that much difference? I know every truck is a little different and know some manufacturers claims are stretched, but my edge didnt do anything for my mileage and I have heard some say it does.

 

Hi.

Another aspect to consider is a faulty component(s) on your truck.

I believe in Marc's case, one of his factory original O2 sensors was contaminated at build time - caused him a bit of grief . Just an example, ( No codes set, either).

Another guy had a faulty IRMC - ... get my drift?

I guess this would involve some comprehensive in-depth diags at a sympathetic dealer.

It could also mean that, simply, your truck is at the left hand end of the manufacturing 'bell-curve' - where stacked mass assembly errors result in a sub-optimal final vehicle. It happens, just a there are also trucks at the other end.

A thorough look-see might help, but it may take $$$ , as most dealers would just say -"they're all like that" ... perhaps an independent shop?

As for a tuner - a tuner will not fix what may fundamentally be 'broken'. All else being equal however, a custom tune is far more likely to net mileage gains than a canned tune, be it a max perf tune or one crafted specifically with economy in mind. The vehicle, of course, needs to be sound.

 

True, but again he hasnt indicated that he was having performance issues, so i didnt think this needed to be said just yet, but this is a very valid point.

 

I have basically the same truck as you (supercrew, 5.4L, 3.73, Edge) with the exception that my truck has 17" rims. When my truck was new, I got almost exactly the same mileage as you are currently reporting (both city and highway). As I've accumulated some miles, the MPG has increased to an average of 13.5 city and ~17.5 highway when driving at the speed limit. (I'll note here that I do my MPG calculations the old fashioned way: by dividing miles driven since last fillup by number of gallons consumed). If I drive a bit slower, say 60-65, I've gotten as high as 18.4 MPG. This increase in mileage is in spite of the fact our fuels here are using 10% ethanol, which tends to decrease average MPG.

Since your truck is so new, I'd be willing to bet your MPG will increase somewhat as you put more miles on it.

Regarding the Edge, I haven't really noticed much of an improvement in MPG when using Level 2, but I did notice about 2 MPG increase when using 93 octane and Level 3. However, even with the improved mileage, it would take a *long* time to recoup the cost of the Edge (and that's not the reason I purchased it anyway). My humble opinion is that it's a bit of a fool's game (and, BTW, I don't mean that in a demeaning manner) spending a lot of money chasing a few extra MPG.

One of the great advantages of having an Edge is that you have access to the IMPG and AMPG PIDs. Using these PIDs, you can observe the MPG you are getting from moment to moment, and you might be able to identify particular aspects of your driving style that could help to improve your fuel economy. I have these particular PIDs displayed on my Edge at all times, and they've certainly helped me to "optimize" my driving style.

Good luck!