I have a 2003 F-150 extended cab sport 4.6 engine 68,000 miles and only getting 11.5 mpgin town. I keep the service up every 2500 miles, I have had the fuel filter changed, and have the transmision oil changed once a year. I am trying to get a little better mpg out of it, Any suggestion?

 

I get the same man. . .

 

tune up might help..ive got a 2002 4.6 with 126000 miles on it and i was gettin 14..changed the spark plugs, fuel filter, engine flush when i changed the oil, injection cleaner...now im up to almost 18 u may wanna look at changin the o2 sensors..i think thats my next step

 

there is no check engine light on think the o2 sensor would still be bad

 

yea they could still be bad....the check engine light doesnt come on for everything...there a guy on here thats got like 215000 miles on his o2's and his light didnt go off...but i was lookin again and if youve only got 68000 miles on it the o2's shouldnt be bad..

 

i've heard of cold air intake system think that would be worth the$$$$$$$$

 

what about cold air intake system are they worth the $$$$$$$$$ and will they help with the mpg?

 

idk..i wanna get one for performance not for gas milage..i think they MIGHT help out like a mile or 2 on gas milage but i think there more for addin a few horses

 

Generally horses increase MPG, thats what our engines lack. Most of us have poor MPG highway becuase these pigs have to constantly pull out of OD to climb a rolling hill or fight the wind. Thats where my main issue is, dropping out of OD to accomplish simple hills. 5.4's will always beat us flat in MPG bc they stay in OD cause they have the horses to keep them right up there without bogging, like our trucks do. . . I'm looking into a set of 4.10's to help her pull, even though I will be at a slightly higher RPM while cruising, she ownt have to constantly drop out of OD. . ..

 

makes sense I have even thought of looking for a bolt on super charger like a paxton or something of that type.

 

well...horses dont really mean an increase in MPG i see lambo's and ferraris and stuff of that nature with like 600 HP gettin 9, 10, 12 mpg and the bigger gears you have means a drop in mpg..my grandad has a 5.4 with 4.10 gears and gets 13 mpg my dad has 3.73 and gets 16

 

gearing makes a difference in mpg but whether it gets better or worst depends on around town or highway driving. with 4.10 gears you'll get better fuel mileage around town but worst on the highway. 3.73 gears will give better on the highway because it the motor will run at lower rpm's but around town it will get worst because the engine will have to work harder to get up to speed.

 

My truck wont see much highway when I'm done with school, so around town and such with 4.10's would be grand. And them Ferrari's arent getting much MPG cause there configurement. You can get 600 HP with a 4six stang and see 26 MPG Highway and have a Ferrari with 600 HP and get half that cruising cause of the number of cylinders. . . Its all about how much work the engine has to do to move the vehicle. Less horsepower means its going to be pulling harder to get going. Increase the HP and that the less work the engine has to do to get going.

 

Forced induction really doe snot improve MPG's. . . Cause at the same time your shoving air down its throat, your just pushing that much more fuel to match. If anything, a turbo since its a non-parasitic load, where as a supercharger requires Horsepower to make horsepower. . . Only things you can do is make her breathe better by adding a CAI(many How-To's on here baout making a home made one) and exhuast.

 

at 68k i would not suspect your 02s are bad. check things like tire pressure. small things that get overlooked can make a difference.