Last post on Oct 11, 2002 at 8:12 PM
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Ford F-250 Super Duty, Truck
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May 17, 2002 (2:02 pm)
I have a 2K F-250 4x4 crew cab, 7.3 diesel with automatic. I get easily 22 to 23 MPG on the highway. with tailgate up and running a/c. anyone else getting the same or better.
May 19, 2002 (7:16 am)
22 - 23 is great mileage. My best to date has been 18.7 with bone stock '01 F-250 SC SB 4X4.
Can you tell me how you get that much better mileage? You must have a secret.
May 19, 2002 (8:17 pm)
I REALLY don't think the TQ is my problem, since I have the 6-speed. I am going to start out simple, you know, the KISS approach. The first thing I will try is replumbing the fuel pick-up and the pre-pump fuel line. I figure $20 in parts, and two or three hours of labor, what could it hurt.
#732 of 768 Mullins, I guess not...
May 20, 2002 (8:29 am)
...didn't realize (or remember) that you've got a manual box. Just an idea, but what about binding throttle linkage or loose/worn motor mounts, or a vacuum leak on the cruise bellows (don't know for sure if our cruise controls drive the throttle with vacuum or not, but...) I've seen surge problems in the past from those sorts of things.
Watkins, I have a 350 version of your truck. The only way I can get that kind of mileage is if I set the cruise at 50 or 55 and drive on a flat road - preferably with a slight downgrade and/or a nice tailwind. If I'm at 65+ it's more like 17-18, and that's running empty with a hard tonneau cover. Is that real mileage you're quoting, or a number from the computer? Short term or long term average?
May 20, 2002 (10:01 am)
If the previously mentioned fixes don't work, then I will check to make sure the TPS is working properly. I never have noticed any surge with the cruise. Whatever is causing the surge is being amplified by axle wrap, IMO. I never have watched the axle while someone else drives it, but I can feel it when I get a little over-aggressive with the clutch. How do you check the motor mounts without taking off the hood and watching the motor?
May 20, 2002 (12:57 pm)
I have the same surge at 70 mph. I don't know of any fix from the dealer yet. Best Mpg for me is 18.5, Avg 13.5 mixed.
#735 of 768 Mullins, you can physically
May 20, 2002 (1:00 pm)
look at the motor mounts for signs of obvious degradation due to cracking, tears in the rubber, etc.
You can also put the engine under load and watch to see if it "torques up" very much. That's easier to do with an automatic; you just put it in gear and keep one foot on the brake while you feed it a little gas with the other. With a stick, you could probably still do it by setting the parking brake and maybe placing some blocks in front of the tires. You could then (with the hood open) peek under the hood while you slip the clutch, or have someone else do it for you while you watch the engine for movement - be sure to stand to one side, and not in front... If it moves more that a half-inch or so when it loads, I'd be asking the Ford guys if there's something wrong.
If I remember right, yours is only a couple of years old, so it's pretty unlikely that the mounts are shot unless you've been awfully rough with it, or have been really unlucky recently.
May 20, 2002 (2:59 pm)
You have surge at 70? Are you a V10 or PSD? From your mileage I'm assuming PSD. If you're a V10, 18.5 mpg!!! - what were you doing, coming down a mountain pass in neutral with a tailwind? I've gotten 14.5mpg - 1.5 hours at 55 mph, flat roads, no wind, no load, no traffic.
From replies I've gotten, I was beginning think that the surge is different between gassers/diesels, and Autos vs.manual trannies. Don't begin to know how cruise control works on a diesel, so I can't even a hazard a guess as to what if any common denominator there is between them. Maybe some programmer goofed in his code when they designed the cruise software.
May 21, 2002 (5:58 am)
Yeah I know, I don't expect to get 18.5 again. I have a V10 CC 3.73. Auto. I was going 65 on flat land with a 25mph tail wind. I29 south from Sioux City Ia to Mound City Mo. No AC, nothing in bed etc..
May 21, 2002 (10:36 am)
Just had to ask 4x2? or 4x4? I have 4x4, CC, 3.73, LWB, auto and have to drive like my Granny just to get 14.5. But it sure is fun to say the heck with mpgs and put your foot into it every so often