problem with Ford Diesel question

[Guest bodasefus]

Have a 93Ford F250 with the 7.3 IDI non-turbo motor. The problem I am having is 12 MPG average... A friend of mine has the same truck a year newer but he gets 18 mpg and 25 on the freeway... Both trucks are stock... any ideas... would the return line have anything to do with mileage??

Thanks in advance

Russ

[buddy]

Nothing stating same weight-tires-load-flat bed-rear end-city-highway etc etc

It can be anything besides your getting better than our work truck course it's mostly city work

 

Reason I stated that way is I was asked the same thing once before from a person stating both were stock come to find out they changed ride high tires exhaust tool boxes so stock maybe not total stock if you know what I mean

[jakester]

Gear ratio can vary from pickup to pickup. This alone can influence mpg dramatically. Might can find it listed on the inside of the glove box or some of them had a tag on the differential.

Bill

[brd7666]

If you have questions about anything Ford Truck related, this is the place to go.

http://www.ford-trucks.com

 

I have been a member of that site for several years. It is the best Ford Truck site on the Internet, and membership is free.

[Sylvester]

It is hard for me to believe your friend is getting above 20 mpg. I have a 2012 6.7 turbo with 373 rear. I have gotten over 20 on occasion. He may have spent money to put a chip and other things in it...but 25 mpg?

 

[Wade 2000]

My guess is yours has a 4.10 gear and his is probably a 3.73 or 3.55 in the rearend

[Bob Myers]

Lifted even an inch will affect mpg, two different brands of tires will affect mpg, gear ratio and driving habits certainly affect it.

I have a 96 with 324k on the clock, 4.11, Gear Vendors overdrive, Swamp injectors and a 100hp chip, if I light foot it and practice progressive shifting I can still do 22mpg, truck used to do 26-28 when it only had a couple hundred thousand on it. Firestone tires get me better mileage than Goodyear, both wear and mpg, cheap rock hard tires you could never balance from Walmart went almost 80k miles and gave best fuel mileage yet

[baylensman]

Did some checking and 14 mpg is about right for one of these trucks. to get it to 22MPG you need

manual trans

3.73 gears or lower (3.55 3.40)

tall hiway tires (no mudders or wide snowies)

cold air kit (banks or KN)

bigger exhaust ( at least a 3" down tube to start)

 

There was some big changes in fuel mangement system between 93 and 94 the newer truck should be pulling 17 MPG around town and hitting 22 on the hwy

 

Sorry but there it is a big difference in model year performance but its in the books

[rbig1]

if I remember right its a international engine

[ragtop69gs]

Dirty injectors ?

[Bob Myers]

Did some checking and 14 mpg is about right for one of these trucks. to get it to 22MPG you need

manual trans

3.73 gears or lower (3.55 3.40)

tall hiway tires (no mudders or wide snowies)

cold air kit (banks or KN)

bigger exhaust ( at least a 3" down tube to start)

 

There is no "downpipe" per say, he does not have a turbo'd engine.

It will benfit some from a true dual exhaust setup, as large of a pipe as can be fitted to the heads without getting crazy adapters, a crossover tube about 40"from the rear of the head will significantly help low end pull,and quiet it down some too. One thing many people over look on a NA diesel is the muffler, i wouldn't add Cherry Bombs or such(much too loud for me) but the closest thing you can get to a straight thru muffler, and as short of a muffler as you can buy will help.

What gears do you have, it has been mentioned many times already you need a tall gear for highway mileage, but not if it is going to ruin you for takeoff and slow pulling power. What are you intending to do with the truck, commute or pull a load? Knowing which of these is the primary will help get the right info the first time.Also,as mentioned, tires,, what is on there right now? Are you inflating to near max pressure?

I had a 92 with 6.9 and a Banks turbo kit, it would do 24 all day at 50-60mph, if I ran it over 60 the mpg would fall like a rock. It was a dually and I put 3.55 gear in to get the mileage up, it had a 4 speed direct, week before I sold it I put a 5 speed od trans in, and new owner wanted the original 4.10 gear back in.

[Bob Myers]

It is hard for me to believe your friend is getting above 20 mpg. I have a 2012 6.7 turbo with 373 rear. I have gotten over 20 on occasion. He may have spent money to put a chip and other things in it...but 25 mpg?

 

 

I see this often Jim, 6.7 is a fuel hog, if you can keep heads and injectors on it.

A 6.9, 7.3NA will do that 20+ if they are setup right, and owner knows how to maximize the efficiency of the Navistar engine as it was intended.

[Guest bodasefus]

OK... Thanks Guys,,, I got a lot of stuff to get it better...