View Full Version : Hints on better MPG on F-350 w/460??

08-01-2007, 10:06 PM
Hey need a little help!! I have a 94 f-350 dually pulling approx 4500 pounds for my mowing rig. I just bought this truck it has 108,000 miles and every thing works well.No smoke etc. My problem is I think i'm getting maybe 6 mpg. What can i do to bump up the mpg to at least 9-10 mpg?????????????:confused: Thanks guys!!!

08-01-2007, 10:22 PM
check you air filters, tire pressure, what engine? dont run the a/c. lose some weight

08-01-2007, 10:28 PM
:drinkup: :drinkup: only weight i can get rid of is the driver and the beer cans when they fly out or get recycled!!!!!

08-01-2007, 11:58 PM
You may try a free flowing exhaust, KN type air filter, Platinum spark plugs, synthetic oil in diffs, tranny and engine, you may also see if you can get a programmer that may help. Running max. air in the tires will help.

Gravel Rat
08-02-2007, 04:50 AM
A 460 is piggy on fuel nothing you can do about it. 6-8 mpg is about the best you are going to get and it will get that loaded or empty.

Give the truck a tune up and run some injector kleener through the fuel.

The 460 works on torque not rpm and horsepower. Always keep the rpms low as the 460 works the best.

Travel'n Trees
08-02-2007, 05:05 AM
check your intake hoses if they colapse under power. msd ignition, exhaust, headers, Kn, hypertech chip, electric fans, 160 degree thermostat with chip, clean up air box, force air into box, dryer duct. We saw 14 mpg. check air pressure, and keep her lubed up, I have had problems on synthetic fluids. delete smog pump, port and polish throttle body, underdrive pullies

Gravel Rat
08-02-2007, 05:15 AM
The one thing to keep in mind is don't spend more money trying to improve the mileage if you will never recoup the money spent in fuel savings.

A 460 is a 460 a big block that loves gas. It might be even worth it to pop out the injectors and replace them with new or rebuilt ones. New squirters give a better fuel spray.

Think you have a egg under the throttle pedal that you are trying not to break.

Travel'n Trees
08-02-2007, 05:26 AM
most of these mods are cheap or you can use used product with little if any problems, except for thermostat. I was just playing around with my dads dump truck to see what I could do with little or no money.dont forget plugs and fuel filter,under a $1000 easy, so around 6000 miles with only a 4 mpg it would pay for itself.

08-02-2007, 11:55 PM
Thanks guys trust me were not breaking any pit road speed limits in ths truck!!!!!!!!!The plug wires look new,so I will check the plugs soon.I've heard the K&N filter will help.

08-03-2007, 01:17 AM
Best way to get more than 6 mpg out of a 460 is to put it on a trailer. I had one of those in a 2wd 3/4 ton and only got about 10, with no load.

08-04-2007, 08:24 PM
trade it for a new f 350....ha! your not goin to get much better than 8 or so out of that engine. just doesnt exhist. kinda like the 8.1 chevy, and the 454!

08-05-2007, 09:11 PM
I think you're just gonna have to deal with it. I had a 1993 F250 4x4 460 with the C6 3 speed auto, and if I drove REALLY easy I could squeeze 10, maybe 11 out of it, keepin her under 45 mph empty. With my 18' flatbed, John Deere 737 Z-trak, 2 w/b's and trimmers and such I usually looked at 9 or 10mpg. I had to drive it about 30 miles back and forth to school for about a month when my 'stroke was getting worked on, 70 mph or so, I never did better than 7 mpg. I loved the power that truck had, it was a snow plowing monster, pushin a 7.5ft Western with pro wings, so like 9.5 ft of plow, never ran out of power. I did re do the exhaust with true dual glasspacks, cut factory exhaust off and put in the packs, I probably gained a mile or so to the gallon from this, but my cat was plugged up really bad too.