tanked_darren

Sell the level kit and trade the tires for a less aggressive stock size. You'll be close or better on his mileage.

Sell the AFE intake it does nothing.

Take all that extra money and use it for gas, making your mileage even better with all that extra gas money.


Yeah some guys say the tune makes it better, do some math though is dropping hundreds of dollars for potential (very minor) MPG gain (requiring you to still drive like there is an egg on the peddle), is it really worth it?

Willard5.0

Lose the all terrain tires too. My MPG average dropped from 19 down to 16.5 going from stock Michelin AT/2 to BFG KO2s. Look into LRR tires, that will net you a nice MPG increase.

SkiSmuggs

I typically see the best mileage with an 87 tune (even canned SCT) and premium top tier http://www.toptiergas.com/retailers.html fuel as recommended in your owner manual. Econo tunes merely make the truck run worse.
Take another look at the chart that shows the relation between speed and fuel mileage, remove level and switch tires.

130428

75mph + winter + lift + tires = 13.8 mpg sounds about right.
all stock, at 75 mph, there are days where I barely see 15mpg if it's windy / cold out...

harrison14allen

Pulling the trailer is what kills on the ecoboost. I get about 11 when towing. Also, driving 65 instead of 75 makes a big difference as far as improving fuel economy goes.

Twelve

13.8 with all those mods & FX4. I am running 14.7 on a stock FX2 with the 20's & 3.31 gears.

RLXXI

You are wrong, the mileage is all hwy set on cruise for 25 mins, reset the meter no starting and only stopping long enough to snap the pic, just pure cruise and it was actually still climbing when I took the pic.

I didn't want any starting and getting up to speed to skew the results, why I have to explain that is a mystery.

elfiero

Like everyone said: Put the truck back to completely stock EVERYTHING, inflate the tires to 50 PSI all around and drive 55 mph using cruise control- you will see at least a 4 MPG improvement. Otherwise, deal with it.

Rockjock3

I don't know about some of the advice you have been given. I have a 4" lift and Terra Grappler 295x70r18s. I lost less than 2 MPH total over pre-lift and tires. That being said, maybe it actually has a larger effect on your engine.


Another thing to think about is your air filter. If you recently got this truck and didn't change it then that could be some of the problem. I have K&N lifetimes in all my vehicles. The reason I bring this up is because over the last few months I have dropped almost ~2mpg average. I have tried shifting fuel stations along with driving habits. I normally drive very reserved (a lot of coasting WAAAAYYYY back when a light has been green for a long time or turns yellow, and slow easy take-offs). I commute 20 miles to work (each way) and have cruise set at 70 both ways. I usually get ~15-16MPG (2013, 5.0, 4x4, SCrew with 3.55). I went down to ~13-14mpg. I did my annual filter cleaning on my rides last week and mileage is back on the truck. The van didn't really have any effect, but I shook about a half a glass of crap out of my truck's filter. I haven't had a truck in several years prior to this one and didn't really think about all the off-road I do for hunting. I will be cleaning my truck's filter every 4-6 months now.


Just a thought.

packplantpath

Spending hundreds of dollars to maybe get 1-3 mpg is a HUGE waste of money and may not work.

If you drive 25000 miles a year 2mpg difference is worth $200-$300. Less at these prices for gas.

A tuner is $300, tunes $100 each. So when if you get the 2mpg difference it is two years just to break even. More if you drive less.

Only guarantee is to slow down and smaller tires.

Get a tuner because it is fun. You might get better mileage. You might not. If you find one who guarantees a mpg increase, then consider it.