Towing..mpg and rpm's - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 12-02-2019, 03:52 PM Thread Starter
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Towing..mpg and rpm's

Hello,
I recently purchased a 2000 Super Duty with an installed Hydra chip, the seller said the tunes installed are as follows:
1. + 65 hp daily
2. +65 hp tow
3. +80 hp daily
4. +80 tow
5. Whisper
6. 100 hp performance
7. 120 hp extreme
8. No start
Last week I rented a U-haul auto transport and towed my sons 1986 single cab f-150 from Houston to N Dakota. Previous owner said he pretty much stayed on #3 for everyday so I started on #4. With overdrive off I averaged about 8 mpg at 65 70 mph, rpms were about 2750 and boost pretty much stayed 5-10 lbs. I then tried #2 with no significant change. On slight grades my boost would reach 15 lbs. I sure wanted to turn my overdrive back on to reduce rpms!!! On the way home without the trailer I stayed on #3 and averaged around 13.5 mpg at 1750 2000 rpms and 0-5lbs boost and of course overdrive turned on. My son who has a 2008 Dodge Cummins said I should have towed with overdrive while on the highway (not city).
I have no idea who did the tunes and if they accounted for the 33 tires. Do the above #s sound reasonable? Should I consider retuning so Ill know for sure it matches my truck?
Thanks
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post #2 of 12 Old 12-03-2019, 05:30 AM
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I doubt there is much difference between 1-4.

Those numbers seem pretty reasonable, considering we do not know the weight or condition of the uhaul we cannot account for that drag.

We tow with tow/haul on because its keeps the boost and trans pressures up, RPMs are good if temps stay down.

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So says the internet... ...and so it shall be.
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OK, thanks for the info. To show my ignorance, what is the problem with 3 nipples...
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post #3 of 12 Old 12-03-2019, 07:01 AM
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On those you should let the trans do it job with the tow on, I only shut it off if it keeps searching for a gear. Here we have mountains and I leave it in tow even climbing passes with my 5th wheel trailer can maintain 60- 65 pretty easy. Getting around 10 MPG .
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post #4 of 12 Old 12-03-2019, 07:35 AM
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You don't need to tow with the overdrive off unless your going up hills and it keeps shifting back and forth.
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post #5 of 12 Old 12-03-2019, 07:51 AM
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i have always towed with od on

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post #6 of 12 Old 12-03-2019, 09:12 AM
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Originally Posted by Randy4614 View Post
On those you should let the trans do it job with the tow on, I only shut it off if it keeps searching for a gear. Here we have mountains and I leave it in tow even climbing passes with my 5th wheel trailer can maintain 60- 65 pretty easy. Getting around 10 MPG .
I do this also - and I also have tried it with the chip in stock mode. Our trailer is about 6,500 lbs and I can get 10 to 12 mpg if I stay at 2,200 rpm or below. I believe rpm is more important to mileage then speed. with around 1,900 rpm seeming to be the best for mileage.

Our truck also has a Gale Banks converter pushing the 4r100 along with a Banks trans commend module.

Early '99 F-250 2WD CC short bed - for DD'ing, towing track car, Overland camping.
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post #7 of 12 Old 12-03-2019, 10:45 AM
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my 250 with stock everything, I find if I'm much below 2000 rpm it probably won't hold the speed on a even mild up grade when towing my 4500 lb trailer, another 1000 lbs of stuff in the back of the truck. if I'm doing 2000-2200 rpm, it will typically hold the speed while staying in 4th/OD on any but a steep grade. if the grade looks steep, i"ll manually drop the OD just before hitting the start of the grade, that way the TC stays locked up (if the OD drops itself while you're on the throttle, the TC probably won't lock up again unless you let off on the throttle, something you're not going to want to do while maintaining speed up a grade).

re: gears and TC lockup, I used Torque Pro to monitor things for the first few multi-day long runs but now I have the feel for it, so really no need anymore, I can tell what its doing by how it sounds, what the tach and speedo says.
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post #8 of 12 Old 12-04-2019, 04:43 AM Thread Starter
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I appreciate the feedback, very good information!! Everything else on the 1500 mile haul worked great, never came close to overheating and egt stayed 600-800 which from what I hear is good.
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post #9 of 12 Old 12-04-2019, 04:17 PM
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Strictly FYI, I recently completed a 9000 mile vacation with our 28 ft travel trailer (bumper pull). The trailer adds ~7000 lbs to the truck so we are going down the road with ~7 tons. With the trailer and Diablo tuner set to the lowest position (I think they claim +50HP) I consistently get 11 mpg. In Idaho it dropped to 10.5 trying to keep up with the semitrucks on I84 . I always tow in OD unless I come to a long grade where I force a downshift and drop my speed. Without the trailer I got 15 +/-1 mpg. I passed 200,000 in Twin Falls, the first time I had to get an oil change while on vacation!
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post #10 of 12 Old 12-05-2019, 05:04 AM Thread Starter
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Thanks Jasgeer, wish I'd asked about towing before my trip, oh well..
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