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Old March 19th, 2008, 10:58 AM   #1
Mikey1258
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Default Diesel Mileage Tips?

Looking for some helpfull input on getting best mileage out of my powerstroke.
What fuel blend?
Additives?
Programmers?
Exhaust?
Air Filters
Driving Habits?

What do you use, and what kinda MPG do ya get?
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Old March 19th, 2008, 11:08 AM   #2
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anything that helps the engine breath better will increase effiecency thereby increasing gas mileage. less restrictive intakes, and exhaust systems will greatly increase the engines breathing ability. remember all an engine is is a big ass air pump. easier it is to get air in and exhaust out the better it will perform and get better mileage. the same principals used by gas engines can mostly be used with diesels
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Old March 19th, 2008, 12:51 PM   #3
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In the F250 that I'm trying to sell on the board I went from 18mpg to 20mpg by slowing down from 70 to 65mph and adding a DIY Tymar intake.

On the new F350 I'm going to do the DIY tymar again this weekend and in the future she's getting a 5" exhaust from FarmBoy Diesel (great prices) and a chip from Tony Wildman!
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Old March 19th, 2008, 02:47 PM   #4
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Staying outta boost whenever possible nets good results
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Old March 19th, 2008, 03:05 PM   #5
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If you want a programmer anyways, adding one that increases timing will help. If it is a ford, go to thedieselstop.com and read some posts over there.

ps Use power service fuel additive, it will help lube the fuel system as well as pay for itself with a small mileage increase.
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Old March 19th, 2008, 03:12 PM   #6
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big intake
big exhaust
no boost
tony wildman chip
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Old March 19th, 2008, 06:55 PM   #7
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Mikey 1258 what year powerstroke are you getting?, what trans manual or auto? What gearing?
There really isn't any one thing that will make a big increase in mpg other than driving habits. If you have a pyrometer drive by it, keep the EGT's under 600* always. This makes a much bigger difference than driving by the boost gage. On the highway keep the rpm's below 2000, let the mph be what ever it is just keep it under 600* and under 2000 rpm. A Tymar intake and a 4" exhaust both will each help a little. Going to a 5" will not help beyond what a 4" will get. A good economy chip program from either Tony Wildman, DP Tuner, or Bills custom chips from PowerHungryPerformance, (notice i didn't mention two of the big name chip programmers thats because I have had them and was not impressed). Increasing timing will help but only to a certain extent, then it rapidly becomes detrimental, possibly to the point of throwing a rod. IMO as a heavy diesel mechanic forget what yo know about gassers not much of it applies to diesels. I know the other guy said it does but I respectfully disagree. I also have not had any appreciable mpg increase with any fuel additive, although I agree the fuel now days needs lubrication added to it.

Last edited by Ggg; March 19th, 2008 at 07:14 PM.
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Old March 19th, 2008, 08:28 PM   #8
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Quote:
Originally Posted by fsumotorhead View Post
Staying outta boost whenever possible nets good results
Roger that. Even though it sounds cool the turbo will kill you on mileage. Try to keep it under 2000 rpm.

Now this is advice that I'm better at giving than taking. Please post if you figure out how to keep your foot out of it.
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Old March 19th, 2008, 08:41 PM   #9
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Depending on the year and displacement, the biggest gain will come from adding a 3" downpipe and getting rid of the catalytic converter. _I say this_ because the early cats on the 7.3L powerstroke did not reduce exhaust emissions as much as they were added to get rid of some oily residue in the exhaust.

Tymar intake - stock airbox is crap.

Drive at or below 2000 rpm.

With those mods, I could get 21 mpg in my 96 F250 2wd supercab with a 5-spd and 3.55 gears.
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Old March 19th, 2008, 09:39 PM   #10
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Hey Mikey,

My last tank I was around 16, had lots of short trips and I didn't drive it very nice.

Best I have seen for this truck so far is about 18.5 but that was before the econo tune from DP-tuner and haven't had this truck in warm weather yet.

If you are going to get a chip/tuner, you NEED a EGT gauge, esp. for towing.

A cover on the back is worth a solid 1+mpg.
Get your tires up max inflation, it's a truck, let feel like one!

Make sure the alignment is good, nothing wore out in the front steering, that is a mpg killer.

Get a better muffler if it is the original. I liked the one I had on my Reg. cab it was made by Walker, straight thru design, a hair louder than stock and only around $50. It really helped get the egts down while towing.

Get a #6637 airfilter (wix#46637) if you get it from www.fleetfilter.com it is only like $27. Stay away from K&N style filters

As the others have said, try keep rpms down. Good luck with that after a tuner is installed.

G/L

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Old March 21st, 2008, 12:33 PM   #11
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Wow

I am on Diesel overload.

What are egt's? Is it neeccessary to replace whole exhaust or just dump the cat and get better muffler? I have been trying to stay under 2k rpm (not working). I also only want to buy a tuner once. I have read plenty about these large TYMAR style air filters. Does anyone have any issues with dirt, or snow/water seeings how the filter box is eliminated?

ty
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Old March 21st, 2008, 12:48 PM   #12
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EGT = Exhaust Gas Temp. You gril into the mainfold, tap and insert a temp prob and then hook it up to a gauge.

I did the DIY tymar and it's been great so far and I have had no problems with dirt.

Also change your fuel filter on time and that will just overall help.
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Old March 21st, 2008, 12:49 PM   #13
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Mikey,

egt= Exhaust gas temp.

I have had no issues with my Tymar style air filter, you can take a peek at mine next time you are around. Plowed all winter with it and still looks great.

Later

Adam
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Old March 21st, 2008, 01:04 PM   #14
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First off Ggg how do you keep it below 600 degrees on the pyro. At crusing speed of 70mph my pyro reads 800 degrees. There really is no way to keep the pyro below 600 unless you are ideling.

To add mpg, to a diesel, you need intake, exhaust, and a chip with a good economy tune on it.

I get 18-20mpg on average in my 2002 F-250.

Now going with a 5inch exhuast is really pointless unless your pushing big hp numbers.

A good straight 4inch exhaust will obtain the same as a 5 inch exhaust on most set ups.

If you have a 6.0L going to the diy intake is pointless as well. It has been proven that the 6.0L has the best intake for it from the factory. Just replace the stock filter with an aftermarket one. Get a programmer like an sct with custom tunes. Then run a 4 inch exhaust on it.

Ultimately driving habbits will change your mpg. So if your looking to obtain the best mpg possible, keep up on routine maitanence, keep the air pressure up in the tires, and try not to idle for long periods of time.

At one point it was better to leave a diesel running now with the new diesels it is better to shut them down instead of idling. Especially with the smaller diesels like the 7.3L, 6.0L, 6.4L, 6.6L.
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Old March 21st, 2008, 01:16 PM   #15
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Quote:
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First off Ggg how do you keep it below 600 degrees on the pyro. At crusing speed of 70mph my pyro reads 800 degrees. There really is no way to keep the pyro below 600 unless you are ideling.
Do you have a chip/tuner?

I could cruise at 70 and EGT's were 550-600.
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Old March 21st, 2008, 01:20 PM   #16
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Do you have a chip/tuner?

I could cruise at 70 and EGT's were 550-600.
Even on stock settings it would still be around 800.


Was/is your pyro preturbo or post turbo.
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Old March 21st, 2008, 01:25 PM   #17
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Quote:
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Even on stock settings it would still be around 800.


Was/is your pyro preturbo or post turbo.
Pre-turbo

Yours sounds high. Stock height and tires?


With my DP-Tuner, my egts went 25-50 lower at cruise in the econ setting.
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Old March 21st, 2008, 01:27 PM   #18
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Pre-turbo

Yours sounds high. Stock height and tires?
Stock hieght with 285x75R16 A/t tires. I have 3.73:1 gears which are stock. I get 18-20mpg daily driving. If I get on the highway I get around 22mpg.
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Old March 21st, 2008, 01:33 PM   #19
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Stock hieght with 285x75R16 A/t tires. I have 3.73:1 gears which are stock. I get 18-20mpg daily driving. If I get on the highway I get around 22mpg.

That sounds about right, maybe your gauge is off a little

It is higher than most trucks I have had/worked on.
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Old March 21st, 2008, 01:42 PM   #20
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did both of you drill and tap your own EGT ports?

I'm pretty leary of the drilling portion of the project.
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