Quest for optimum fuel mileage - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 05-03-2011, 10:44 AM Thread Starter
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Quest for optimum fuel mileage

I love power as much as the next guy but I really want to improve fuel mileage in my 6.0. I have a 2005 F350 crew cab automatic that is bone stock (90,000 miles). I would like to improve fuel mileage without compromising the integrity of the drivetrain. Is it possible to pick up decent fuel mileage going EGR delete, high flow 5" exhaust, and a SCT tune without hurting anything? If I am going at this the wrong way, could you point me in the right direction?

Thanks guys.
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post #2 of 8 Old 05-03-2011, 11:06 AM
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Really depends on what you are expecting as far as an improvement?

I haven't done the EGR delete, tuned for the valve to be shut on the stock EGR cooler. Looking to upgrade to the one from BDP.

5" exhaust may be excessive, might get away with a turbo-back 4" system.

With tunes, I ran a tank for an economy last week. Using a street tune on an otherwise stock truck (I am studded, don't see that playing into the equasion). I picked up a 10% gain in milage 13.3 mpg stock, to 14.6 tuned. I'm stock hight CCLB DRW with the 4.30's. That is a combined city/highway tank running to and from work like I always do. The thing I recommend, get a high HP tune that is safe for your truck and get your foot out of the throttle. I'm very pleased with what I've seen with the street tune, and I'm testing my race tune in the same fasion right now.
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post #3 of 8 Old 05-03-2011, 11:28 AM
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I agree 5" not necessary.. 4" Turbo Back. Delete Cat and muffler.. Also 5w-40 syn oil, Rev X, Zoodad Mod, Fuel additive as well (FPPF or Diesel Kleen every fill up). Thats alot of money and the best I have seen is 17 in town and 21 on the highway. I hope you get what your looking for. Oh and don't forget the block underneath your pedal after the tunes its hard to stay off of the skinny pedal.. OH and make sure your FICM is in good shape.


2005 F-250,6.0L, Torqshift, 3.73, Edge Insight CTS, ISSPRO Ev2 Fuel Pressure Gauge, Upgraded Fuel Pressure Spring, Sinister EGR Delete, Sinister Coolant Filter kit, New Oil Cooler, Cat ELC coolant, Turbo Infeed and Drain Tube, STC fitting upgrade, SCT x3 from Eric at Innovative, BFG All-Terrains, REV-X, Mobil 1 5w-40 Syn, 58v Swamps FICM, Stock Otherwise
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post #4 of 8 Old 05-03-2011, 11:48 AM Thread Starter
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Thanks for the replies!

I agree with staying out of the throttle. In my earlier years this would have been a problem but not anymore. Perhaps 5" exhaust is a bit overkill, I suppose 4" would suffice.

Fordwake- 17 and 21mpg (unloaded) would be phenominal. This is exactly what I am looking to get! I figure I will nickel and dime my way into this range.

colo_dually- Making a 10% improvement is decent. I'd like to pick that up in a tune alone if that's possible. I run a stock ride height and wheel diameter. I think 10% can be doable, especially paying attention to how I am driving it.
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post #5 of 8 Old 05-03-2011, 11:53 AM
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Originally Posted by FordWake View Post
I agree 5" not necessary.. 4" Turbo Back. Delete Cat and muffler.. Also 5w-40 syn oil, Rev X, Zoodad Mod, Fuel additive as well (FPPF or Diesel Kleen every fill up). Thats alot of money and the best I have seen is 17 in town and 21 on the highway. I hope you get what your looking for. Oh and don't forget the block underneath your pedal after the tunes its hard to stay off of the skinny pedal.. OH and make sure your FICM is in good shape.
Zoodad Mod???

SCT, no studs...yet, Dual OEM intake air filter housings, Banks intercooler & intake elbow, Banks exhaust system, Windrunner ported intake manifold, Bullet Proof Diesel remote oil cooler & thermostat, AirDog2 (plus a couple spares), Power steering filter (Amsoil dual-bypass), MagTec deep ATF pan, Electric oil pre-lub pump, Dakota Digital gauges.
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post #6 of 8 Old 05-03-2011, 11:59 AM
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biggest gain I got so far was the cheapest...cat delete pipe. Tunes surely help but that was the only one that made me say wow.


2004 CC-SB 4x4 King Ranch 8" Skyjacker 17" MT SideBiters, 37" MT Baja MTZ's, Road Armour front and rear winch bumpers, PIAA lights all around, Thule Racks, SCT Livewire IDP Tuning, EGR and Kitty Delete, Under Armour and Wounded Warrior Project Wrap

Turbo and Exhaust on Deck...

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post #7 of 8 Old 05-03-2011, 12:19 PM
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Zoodad Mod???
zoodad mod?


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post #8 of 8 Old 05-03-2011, 01:09 PM
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Originally Posted by Kraftsman View Post
Thanks for the replies!
. . .
colo_dually- Making a 10% improvement is decent. I'd like to pick that up in a tune alone if that's possible. I run a stock ride height and wheel diameter. I think 10% can be doable, especially paying attention to how I am driving it.
I was amazed when I filled up, I had noticed the difference on the tripometer since loading the tune. It was a little under what I had expected with was a 2 mpg gain, still tweeking how I drive with the tune and seeing if that can get better. After I get this tank with the race file used up, which by my guess may even be better than the street file on my truck.

A few pieces of advice, first allow your transmission to adapt a bit before running anything WOT after you load the tune. Try to keep your boost and RPM's low and kinda let off the gas to shift (with my files a let off around 2k-2.2k rpms), boost I let hover around 8-10 lbs. And keep up with the maintenance on the truck, the 6.0L runs best with clean filters, fluids, and oil.
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