Improveing mileage on 03 7700 f 150 truck

JTEXASREB

MEMBER
2003 FORD F-150
145,000 MILES

Hey guys I just got a 2003 ford f 150 with the 5.4 motor. The truck has a factory set up to run lp gas or gasoline, the fellow I got it from had drove it on gasoline only for the last 40 thousand miles its the seven lug 7700 series truck, my qustion I am getting only about 10 miles per gallion on gas what can I due to improve my mileage, how about cold air intakes, aftermarket mufflers will that help, also are their any performance chips for this truck with the above moter set up on the lp and gas, if they are do they really improve performance and mileage on a gas moter. I would like to find a good mech to also check out the lp system and if not to expense get to truck to operate on it some if getting it going is on lp gase is to expense I will more than likely take system off what can yal tell me and whats yalls advice

2 Replies

HMAC300

MECHANIC
48,601 POSTS

The manufacturers of the chips claim it gives 2 mph on gas engines. And adding the other intakesan dexaust is kind of minimal at best in my opinion. For the cost of that stuff you can buy alot of fuel. Same for the chip things. You might check out the geararatio in the truck if you don't do alot of hauling stuff, that would help a little as well. Your truck should get the best mileage off of gasoline. You might just try replacing fuel and air filters first as it's cheaper and get a vacuum gauge so you don't put your foot into it all the time. Those are available as well. Ford reccomends replacing fuel filters every 15,000 miles. At least that's my opinion

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Tuesday, June 12th, 2012 AT 12:11 AM

CJ MEDEVAC

MECHANIC
11,004 POSTS

FOR YEARS I TRIED MANY THINGS TO "BEAT" THE 16 MPGs MY '77 CJ 5'S CARTER BBD CARBURETOR PRODUCED, I TIED A WEBER CARB, AND EVERY WITCH DOCTOR TRICK IN THE BOOK (WITH ALL OF THE PROMISES, I SHOULD HAVE BEEN PRODUCING FUEL INSTEAD OF USING IT, ACCORDING TO MY FRIENDS)

....IN THE END, I INSTALLED A 4BARREL INTAKE MANIFOLD ON MY SIX CYLINDER, AN EZily AND FULLY ADJUSTABLE HOLLEY 390 CFM 4 BARREL CARB, AND AN O2 SENSOR OPERATING AN AIR/FUEL GAUGE TO AID IN SELECTING "JUST THE RIGHT JETS" FOR MY CARB

I DID BEAT THE "16 MPG"...I NOW GET "18 MPG".....I PROBABLY SPENT OVER $2000 GETTING THERE, NOT TO MENTION THE TIME I HAVE INVOLVED.

YOU CAN INSTALL A VACUUM GAUGE ON YOUR DASH

PLAY THE GAME..."HOW HIGH CAN I KEEP THE VACUUM GAUGE NEEDLE!" (ACTUALLY MEANING, HOW LOW YOU CAN KEEP VACUUM)!

IT'S SORTA "DUMB FUN", KEEPING IT AS HIGH AS POSSIBLE, WHILE ALSO TRYING TO MAINTAIN ACCEPTABLE DRIVABILITY!

A VACUUM GAUGE WILL ALSO ALERT YOU AS TO PROBLEMS WITH YOUR ENGINE.

I HAVE ONE ON THE DASH OF BOTH OF MY JEEPS. MAINLY FOR SEEING PROBLEMS, THE NEEDLE WILL BE HIGH AND STEADY IF ALL IS FINE,.......IT MAY WIGGLE, GO HIGH/ LOW, SHAKE, ETC. IF SOMETHING IS WRONG...SEE THIS

http://www.secondchancegarage.com/public/186.cfm

AND THIS

http://www.youtube.com/watch?v=MBYVZLRyQjk

THIS CAN BE PERMANENTLY MOUNTED. ---IN MY '77 JEEP IT IS THE TOP RIGHT GAUGE (A STEADY 22 INCHES [Hg] AT IDLE)--IN MY '46 IT IS THE BOTTOM RIGHT GAUGE (A STEADY 20 INCHES [Hg] AT IDLE)

I'VE TRIED ABOUT EVERYTHING THAT PROMISED IMPROVED MPGs--FROM THE OPPOSING MAGNETS ON THE FUEL LINE TO THE TORNADO MAKER ATOP THE CARBURETOR.

I HAVE FOUND NOTHING BEATS KEEPING UP WITH SCHEDULED MAINTENANCE, AND A FINE TUNED VEHICLE, FROM THE TIRES TO THE CARB.....AND SENSIBLE DRIVING.

A WEB SEARCH MIGHT SUGGEST OTHER THINGS TO BE AWARE OF IN YOUR QUEST FOR BETTER MPGs......GIZMOS LIKE THIS, DON'T CUT IT!, IT DOES DO WHAT THE MAN SAYS, BUT I SAW NO IMPROVEMENT WHEN I MADE AND INSTALLED MINE!(THIS IS NOT THE VIDEO I USED, IT SEEMS TO HAVE DISAPPEARED)

http://www.youtube.com/watch?v=P-D0dCjx2NI

ANY THOUGHTS?

THE MEDIC

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