I have some fuel pills I will sell you.

 

All I have to say is if you buy a 6,000 pound truck with a 5.4 V8 and are expecting 30 miles per gallon then you prolly bought the wrong vehicle.

 

I've been getting about 10 mpg around town, but then I've also been pretty heavy on the gas pedal since I got my Volant and everything else installed.

 

12.5 mpg to 13 in the city here. Havent spent much time on the highway yet but I saw 15.5 on a mixed tank last week. I drive to keep up with the flow of traffic, not the first guy away from the lights, not the last.

Please forgive my newb question but, I bought my truck used and I have no idea what gears it has, can anyone suggest a way to check? Or is there a website I can use to get a build sheet or window sticker for my ride?

Thanks

 

10 MPG from day one even after the mods I have done I get 11 MPG if I am lucky and not heavy footed. Big slow and heavy = *****ty MPG!

 

I dont have this problem but I know some of these trucks run very rich, too rich. I saw it with my own eyes on the Dyno at Troyers. He was able to correct the problem. If you are getting that bad of mileage you may consider custom tuned programmer. Improve performance and mileage, no brainer if you ask me.

 

Watch the air in the tires. The pressure required on the highway is significantly different that what's needed off-road.

Running pressure on the high side of the tires rating will improve mileage by lifting the outer tread off the pavement, thinning the contact area and reducing the rolling friction. Do this at your own risk, it will effect the ride and braking distance.

 

Well, when I first got my truck in DEC 04, I was gettin about 16-17mpg. A year later and after getting flowmasters and a tonneau cover, I'm down to 14mpg. I though these things were supposed to help

 

Check the tag on the differential, on the right side, check the axle code in the door, mine is H9, which is 3.55 LS, or, jack the truck up, mark the inside of the wheel, mark the drive shaft, put in neutral.. rotate drive shaft keeping track of exact number of revolutions it takes to completely rotate the tire 1 time.... you'll get an idea from that....

 

I doubt he was expecting 30mpg......but 11-12 on a stock truck on the highway @~75 is NOT right, unless you are going up a hill all the time, or pulling a heavy *** load. I have a damn supercharger on mine and I do about 10% city and 90% highway and get 16-16.5 usually for the total tank. I'd suggest a reflash and I bet that will help!

 

Check this thread for all your answers:
https://www.f150online.com/forums/sh...d.php?t=232838

 

I know the feeling. I've concluded, however, that a Flowmaster will inevitably cause worse mileage. The thing must be sonically tuned to a certain frequency that causes the brain to force the foot down on the pedal more than would normally be the case. But then, what the hell! It sounds soooooo gooooood!

 

Mods: K&N FKIP Intake replacement, True Dual (cut out they Y pipe) Magnaflow exhaust

My worst tank so far has been 12mpg around town, and I've gotten as high as 18.5mpg on the freeway. Getting around breaking mileage (almost 5k), and am seeing a slight improvement from 17.5 to around 18.5 on the freeway, could be the mods though. I use the cruse mostly, and disable O/D going up hills, I know it's higher RPM, but it uses a lot less throttle to generate it, and I think it pays off. Thats mostly 75mph+ freeway driving too, if you slow down to 65-ish you could probably get a 20mpg tank.

 

Mythbusters on Discovery channel did a test of f150's with or without tonneau
covers. They got better milage without them. Myth busted.

 

No, they did a test with or without the tailgate up or down, and it got better mileage with the tailgate UP because of the non-moving cusion of air created in the bed. The air then flows over that cushion and over the tailgate greating less drag. With a tonneau cover, you have a SOLID area there instead of just a cusion of air and the air flows right over the back of the truck with even more effeciency.