Re: Don't want to start a diesel truck battle, but

Posted by Diesel Fuel Mileage****T_ on November 28, 2003 at 11:43:14 from (171.75.7.120):

In Reply to: Don't want to start a diesel truck battle, but.... posted by Tom on November 28, 2003 at 06:50:16:

Hi Tom,

Here is reprint of some of my diesel thoughts that I've used on the RV forums with my 2k2 F350, DRW, CC, 6x6, lwb, PSD, 6spd, 3:73 :

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What you need to do is set-up a test road for base mileage check. Mine is 125miles RT on a Interstate. About 60%flat and 40% rolling hills from 1400ft to 2200ft and is a typical Interstate for my area. I only use Flying J fuel (Conoco) using the same pump to fill up each time. I'm 10 miles RT from the Interstate and Flying J is off the exit ramp.

Driving like I have a egg under my foot, I can squeak out 20.75mpg@55mph on my test road and 19.2@61mph, 18mpg@65, 17.1mpg@70mph. Thats is good as it's going to get for "me" and my base mileage.

I decided on the 19.2mpg@61 was a good average for me to live with. I then tried shifting at different rpm's. If I stepped on the pedal just a tad too hard while swaping gears that can drop me down too 17mpg, depending on how hard I push the shifts and take offs. 18mpg is easy to come by but I have to work to get that 19.2mpg. My engine is very picky on how it's driven for mileage.

After about 10 trips on my test road retraining my thinking on how to drive the PSD, I now get 19.2mpg@60mph with towing 20kGCW for 60 miles@25mph, 80% hi-way, on each tank and every tank. I shift at 1300rpm.

No it's not a fluke as I now have about 15000miles on and every tank full is the same, 19.2mpg. The only time my mileage does change is when I forget to use my "new" driving style or towing a load.

On two recent Az to Co trips, 1900 miles each, towing 16k GCW I got 14.1mpg average!

You might also reset the PCM. Disconect the battery's over night. Thats helped when my mileage has been off the normal.

You might want to set-up your own test road just to see what your X can do at ,55, 60,65 and 70mph as a base test. If your mileage improves then it's your driving style that needs adjustment, if not then you need to look at why the low mileage and the first thing I would look for is air in the fuel, thats providing your all stock, tires, no chip, no lift, air pressure correct, etc..

Engine lugging is adding fuel without gaining RPM at WOT and can occur at any RPM.

Below is what Ford says about lugging in the F650/750 owners manual:

"Excessive full throttle operation below peak torque RPM will shorten engine life to overhaul and can cause serious engine damage. Operation of the engine below peak torque RPM can occur during gear shifting due to difference of gear ratios."

T_Bone

Follow Ups:

• Re: Re: Don't want to start a diesel truck battle, Diesel Vs Gas ***T_Bone 11:46:42 11/28/03 (0)

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