Me either...

 

The best I can do is 14 around town and 16.5 on the highway.

 

my BS meter pegged out.

 

This topic comes up once a month. At the risk of suggesting you read the past several months answers to this same question with the search, just wait another few weeks, as it will get asked again, and you'll get the same answers again.

I can now understand why folks hate the search; you get flooded with topics, because these questions come up so often.

5.4's are not known for their mileage, but then again you already know that, or you wouldn't be asking it. In past posts (there are soooo many of them), the mileage posted for 5.4's has been in the 11 to 16 range. Some have said they get worse mileage then the average posted here; I suspect they have a badly out of tune engine, or tow heavy loads, or have engine or tire modifications that will also kill mileage.

Some say they get better than 17-18. If you drive downhill, with hurricane force winds at your backside, then you can average better than 16 MPG. I say average because the 5.4 is not going to get constant averages over 18. A scanguage or programmers may show higher, but it's usually when your foot is off the gas pedal, and/or your costing; as soon as your back on the gas, your average is back to 16 to maybe 18. My 4.2 V6 averages 19 to 21 depending on city/highway driving, with/without a load. My scanguage will show high 20's when I'm coasting to a light or stop sign, but I really don't count that into my "average MPG".

 

I've got a 06 AWD with: Headers, CAI, Elc. fans, Underdrive pullys, 3" est., Tuner, 305/35-24" tires. Most of the trips are short (7-10 miles), in town.
The last time I looked I was getting around 15.
I thank thats "verry good"!

 

"I have an 05 and i have a 4.6 also and i put a K&N cold air induction system, Granatelli Motors Sports M.A.F., and just recently a 3" true dual with x pipe exhaust and now i get on avg. 27-28mpg. So I if you just stuff more air down her throat it'll pay off alot!"
I'm not buying this either!

 

BS. Sorry, with the 4.6L 4spd auto and the best gears out there, no matter the mod, you aren't reaching mid-high 20s. Simply not possible. Even if all your driving is highway with the CC set at 55mh, it ain't happening.

But oh, welcome to the site and thanks for your first post.

+1

Simply not possible.
Well warming it up hurts. Using cheapo gas isn't good for mpgs either. So I feel your pain.

My truck (see sig below), only mod is the programmer/tuner, I get 14-15mpgs city, give or take depending on how hard I drive it, which I'm usually easy going on the gas. Even without the tuner, it still got about the same mpgs, just not the better performance.

First thing is, what gears do you have? Are those stock size tires or oversized? How much stop/go do you do? What kind of gas are you using? How many miles on it?

 

Truck is a 2004 FX4 with 80k miles. Tires AFAIK are stock sized. Gears I don't know. Bought it used. I haven't been able to get over to the Dealer to get a print out based on the VIN yet... I am afraid it will cost more $$ than it is worth to just "know".

The last two tanks I bought came from Kroger (fuel points == .20 cents off per gallon!) Kroger is a wholesale, so their gas can come from anywhere. So I have who knows what gas in there now, seeing about 11mpg. Last tank was 14.5 also Kroger gas. However I had a fair bit of highway milage on that tank. Previous tank was nearly all city driving and netted 14mpg. That was Marathon branded gas. Speedway, also wholesale, gave me 17.5 MPG and that was 75% highway. Best tank ever was a mix of BP and ? (whatever the dealer gave me) and I got 19.5 and it was a mix of City, Country, and Highway.

My drive to work takes me through 7 lights over 3.2 miles. I have to stop (usually) at 4 of those. I have considered taking another route that is 1.1 miles longer but has far fewer stops and more distance between those stops. If I can get another 1mpg from that route it would be worth it. I just have to see what is most efficient.

 

Gas mileage is also worse in the winter than it is in the summer, because of the additives that are put in it.

 

True, but the cold weather also impacts performance as well. Kind of hand in hand.