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Author Topic:   PSD mileage
Dad Vishus

Posts: 836
From: Moscow, Iowa, USA
Registered: Dec 2001

posted 01-24-2002 08:20 PM     Click Here to See the Profile for Dad Vishus   Click Here to Email Dad Vishus     Edit/Delete Message   Reply w/Quote
I am driving a 2000 crew cab DRW powerstroke towing a 28 foot enclosed tag race trailer. The truck is an auto trans with the 3.70 gear.

With about 13K miles, I am getting 9 mpg at best towing and have gotten 14.75 mpg running empty.

The truck is completely awesome for towing, steady as a rock even in high winds on the Interstate.

I am seeing PSD owners reporting somewhat better mileage than I am getting.

My dealer suggested checking the computer settings. I haven't had that done yet. I was also looking at the DynoMax 4 inch exhaust system and the Hypertech tuning module to change the computer settings. I am somewhat leery of that as I'm told the auto trans won't stand much HP increase.

I love the truck, but I'm a bit disappointed in the mileage.

Any ideas?

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Posts: 2377
From: Fort Madison, Iowa USA - United We Stand
Registered: Oct 99

posted 01-24-2002 08:51 PM     Click Here to See the Profile for 68F100   Click Here to Email 68F100     Edit/Delete Message   Reply w/Quote
Welcome to M&M Dad Vishus I assume you are the father to kid vishus. I don't have an answer for your question, but I'm sure someone will.

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Posts: 3984
From: Biddeford,Me.USA
Registered: May 99

posted 01-24-2002 09:39 PM     Click Here to See the Profile for MLariviere   Click Here to Email MLariviere     Edit/Delete Message   Reply w/Quote
I know someone with the same setup in a 2002 truck. He put the module and exhaust,and he claims 22mpg empty. He also says it woke the truck up. Just be careful,if you blow something,they will probably not warranty with the mods!

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Posts: 9743
From: Monterey, CA Mustangsandmore Member #437
Registered: Apr 2000

posted 01-24-2002 11:51 PM     Click Here to See the Profile for Stewart   Click Here to Email Stewart     Edit/Delete Message   Reply w/Quote
DV, welcome to M&M! I too am assuming you're KV's father, yes?

As for you question, I know when new chips are used, usually the exhaust temp gasses need to be monitored. I've seen trucks using the Banks system, and they all had gauge pods installed, one of which showed the exhaust temperature.

Check out They might have a bit more info for you.


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Posts: 968
From: Gadsden, Al
Registered: Aug 99

posted 01-25-2002 11:50 AM     Click Here to See the Profile for Dave_C   Click Here to Email Dave_C     Edit/Delete Message   Reply w/Quote

From the discussions on the forums mileage seems to vary widely.

I have a late 2001 (August build date) F350 with the PSD/Auto. So far it has 3000 miles. I'm getting a solid 18 mpg highway, 16.9 all round and got 13.9 on my first tow with the race car (24" heavy steel open trailer )and that's with 4.10 gears.

The first thing I would do is have the pcm computer re-flashed. Ford has upgraded the program several times. The program controls the fuel curve and transmission among other things. There is a sticker on the inside of your driver's door near the top hinge with the current computer code. Mine has PMT3. If you have any kind of electronic engine work done Ford always updates to whatever the latest code is. No charge if you don't ask. If you do ask and there is nothing wroing it's about a 1 hr labor charge. But, since you have a 2000 model you are in luck. Ford has a Technical Service Bulletin out about the 2000 models. Lot's of complaints about mushy/slow shifts fromt he trans. Many guys on the other site have made this complaint and got the flash upgrade free under their warranty. These guys report much better shifts and somewhat improved mileage. It's worth a try.

One other thing to consider is the fuel blend. Depending on what part of the country you are in the mileage will vary depending on how the fuel is blended to keep it from gelling in cold temps. They mix #1 diesel in with the #2. I'm in Alabama, so not much #1 is needed.


David Cole

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Dad Vishus

Posts: 836
From: Moscow, Iowa, USA
Registered: Dec 2001

posted 01-25-2002 04:29 PM     Click Here to See the Profile for Dad Vishus   Click Here to Email Dad Vishus     Edit/Delete Message   Reply w/Quote
First, yes I am to blame for Kid Vishus. I could blame it on his Mother, but he looks too much like me.

I left out a couple of things.

I was told when I bought the truck by the dealer, who had driven it as his personal demo, not to tow in OD. That makes for some fairly high RPM on the hiway. Our normal week-end tow is about 130 miles each way on hilly 2 lane roads. I don't try to run in OD on those trips.

I have run in OD on the interstate when I can run over 70MPH. That keeps the RPM over 2000 which is where it seems to want to downshift.

Our Race trans. guy also does tow and heavy duty stuff, and he claims that the things get hot when the converter unlocks. I have purchased a temp guage, but haven't got it installed yet. I understand that is one of the things that can be reprogrammed with the HyperTech module.

I don't want to get too stupid with mods on this, it has adequate power, cause I don't want to put a new tranny in every year. I just would like a little better mileage.

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Posts: 43151
From: Saco, Maine
Registered: May 99

posted 01-27-2002 06:56 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
This week's Crank and Chrome show had them hopping up a PSD.

What I found interesting was the segment on the PressureLoc Transmission Control

1995-2001 Ford E4OD & 4R100 Transmissions. The BD PressureLoc plugs in
and increases your transmissions hydraulic pressure to hold the clutch plates
together to prevent slipping which results in over heating and premature wear.

Stock Ford automatic transmission pressures are not high enough at idle for
exhaust brake applications or at light throttle position for stock and modified
engine power.

Additional engine performance results in less throttle travel to achieve the same
vehicle speed which results in less hydraulic pressure that is holding the clutch
plates together. The PressureLoc increases the pressure every time the lock up
clutch engages. This increases the pressure applied to all the clutches in the

Exhaust brakes engage when you have your foot off of the accelerator pedal and
this is when transmission pressures are the lowest. When the convertor lock up
clutch is engaged 100% of the retarding power can be transferred but the clutch
applied pressure should be increased with a PressureLoc.

This new state of the art technology has been designed to easily plug into the
transmission. It increases the pressure to a predetermined level rather than a
percentage increase over the present level. "


'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC

MCA Member # 47773

Of all the things I've lost, my mind is what I miss the most.

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Dad Vishus

Posts: 836
From: Moscow, Iowa, USA
Registered: Dec 2001

posted 01-28-2002 12:54 PM     Click Here to See the Profile for Dad Vishus   Click Here to Email Dad Vishus     Edit/Delete Message   Reply w/Quote
Thanks Steve.

Interesting stuff. Thier power chips are higher priced than the Hypertech module, but preprogrammed, of course.

I think I'm going to start with getting my dealer to reflash the module and get the 4" exhaust.

That may be enough to acomplish what I'm after.

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