I have searched the forum, and seen quite a few mileage threads. There seems to be a preponderance of folks claiming to get 15+ MPG in mixed city/hwy usage, with a similar setup to mine (and some saying 18!).

I am only getting 11.5-12; anyone have any thoughts? 5.4, 6 speed, 4x4, 3.55 LSD, and I have been babying it. 1100 miles on the truck; I don't have a cover (yet), which will help some, but it is not going to magically add 3 MPG to the truck.

TIA

Gary

 

Everyones idea of "babying it" is different. I never hit the expressway the entire last week and with a little babying it I do get 16 avg. With a little more heavy foot I can bring that down to 12 with no problem. Lots of stop and go traffic will do it too. Just so many varibles.

 

Im getting 13.7 and I have 800 miles on mine

 

I noticed my fuel economy improved after 3000 miles.

 

My truck started out at 13 The more it broke in the better it got. Now with almost 10,000 on it I avg. 17 to 18 mpg thats mostly city w/ the 4.6 3v 6 speed

 

I'm at 3800 miles and getting 14 mpg. Mixed driving with more local than highway. Highway is much better but I haven't measured it yet. I'm sure the wheels are cutting mine down. I have FX4 5.4, 6 speed, 4x4, 3.7 LSD, 20 inches wheels.

 

200 miles on mine and I am getting 14.7 on the gage. The gage red 11.1 when I picked it up with 61 miles on it. I am guessing 14 city and 19 hwy.

 

Are you using ethanol. With gas mine improved after about 3000 miles. I tried E85 and I couldn't get any better the 12.5 mpg on the highway around town was 11.5 mpg

 

As big_ole_truck states, you have to get a few thousand on the drive train for the true MPG to be apparent. I, too, realized better mileage after about 3,000 and now I have 5,000 (just today) and the truck is running the best it has, since the purchase date on June 1st. I have the same engine, trans, diff, setup as you do.

All the moving parts of the engine, trans, diff's, and axles, add a lot of friction when brand new and not broken in.

Also, as others indicate, a lighter touch on the pedal, will make a big difference and you can see it on the digital MPG readout. I have also noticed that the readout will be slow to change, unless it is reset often, for varied road types. On a recent trip to SoCal on I-5, I reset the meter every hundred miles or so, to get a feel for the mileage at any given point on the road, such as when climbing grades.

Some days around town I am getting close to 15 and on other days it is close to 12. On the freeway, with cruise control at 65-70 I have had read outs in the 18 to 21 MPG range. I also double check and do the miles vs. gallons math at fillup time. I am usually within .5 to 1.0 MPG from the readout vs. the pump reality.

 

Same set up on my truck and i filled up last night and manually figured my mileage and i am getting 17.7 mpg and computer says 1.85 mpg.