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post #1 of 13 Old 12-23-2009, 03:17 PM Thread Starter
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New to the board, New to a PSD... MPG Question??

Hi! I have been lurking on here for the last couple months taking in all the good info. I bought an '04 F-350, CC LB, FX4 almost two months ago. So far I have a Rough Country leveling kit (with 4" blocks in the rear) and 4" turbo back MBRP. I love this truck!!

My question is about MPG... I just made a road trip from Denver to Flagstaff, AZ and only averaged 14 MPG... I thought I would see an improvement with the exhaust, but noooo.

Is this MPG to be expected? What can I do to improve it?

Thanks!
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post #2 of 13 Old 12-23-2009, 03:19 PM
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Thats about average. Do you have bigger tires? Put a custom tune on that thing and it will help a good bit

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post #3 of 13 Old 12-23-2009, 03:27 PM Thread Starter
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Thanks Goose! This board has been a great source of info.

The tires are a little larger... not much though. I figured my speedo is 2.5% off on miles by checking mile markers for 100 miles.

Oh, I drove 77-80 mph at 2250 RPM. Maybe that's it??

2004 F-350 FX4, CCLB, 2 1/2" Leveling Kit, 3" blocks in the rear, 4" turbo-back MBRP...

Wish list
- AFE Stage 2si
- SCT X3


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post #4 of 13 Old 12-23-2009, 03:32 PM Thread Starter
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OH! Another quick question...

When I first start the truck with the new exhaust it sounds AWESOME. Very deep tone. Then, after like 30 seconds, it sounds VERY restricted. The whistle starts (which I know is the turbo), but all the deep tone is gone. The tone comes back if it is under load or if I get the RPMs up to 2K or above, but just not the same ... Although it is still pretty sweet sounding like a jet on the tarmac

The guy who put on the exhaust says it is the waste gate valve??

2004 F-350 FX4, CCLB, 2 1/2" Leveling Kit, 3" blocks in the rear, 4" turbo-back MBRP...

Wish list
- AFE Stage 2si
- SCT X3


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post #5 of 13 Old 12-23-2009, 03:33 PM
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Quote:
Originally Posted by Mile High Stroker View Post
Oh, I drove 77-80 mph at 2250 RPM. Maybe that's it??
That is definitely it. Anything over 2000 rpm kills fuel mileage.

The Mullet Mod
Stock 2005 F-350 4x4
*Afe Intake
*4" TB Exhaust
*Scangauge
*SCT
*
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post #6 of 13 Old 12-23-2009, 03:33 PM
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the best mpg ive seen were when my rpms were below 2000


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post #7 of 13 Old 12-23-2009, 03:42 PM
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Quote:
Originally Posted by Mile High Stroker View Post
OH! Another quick question...

When I first start the truck with the new exhaust it sounds AWESOME. Very deep tone. Then, after like 30 seconds, it sounds VERY restricted. The whistle starts (which I know is the turbo), but all the deep tone is gone. The tone comes back if it is under load or if I get the RPMs up to 2K or above, but just not the same ... Although it is still pretty sweet sounding like a jet on the tarmac

The guy who put on the exhaust says it is the waste gate valve??
Its the turbo. Waste gates are on a 7.3l

The Mullet Mod
Stock 2005 F-350 4x4
*Afe Intake
*4" TB Exhaust
*Scangauge
*SCT
*
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post #8 of 13 Old 12-23-2009, 03:48 PM
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you wont see an increase with just the exhaust... you need to get a custom tuned SCT... but there are alot of factors to MPG like tire pressure, elevation, temperature, and what RPM range your in

-Raul


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post #9 of 13 Old 12-27-2009, 07:46 PM
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I absolutely concur regarding the 2000 rpm.
Last year, I traveled from Denver to El Paso, and back in my F-250, as part of a military convoy (in GSA vans) so we were restricted to 55-60 mph on the highway per gov't regulations. I got 21-22 mpg on this 1200 mile trip. On different "non-military" trips of similar distance and terrain when I traveled a more reasonable 65-70 mph my mileage drops off to 18-19 mpg. In a couple of instances when I had a particularly heavy foot and averaged more like 75-80 mph, the mileage really drops off. I have wanted to plot this on a graph but haven't got around to it, but I think the mileage drops off exponentially at speed above 55 mph. One key is keeping an eye on the turbo psi - if the turbo psi starts to rise, your fuel economy is going to drop. Under no-to light-loads (i.e. not accelerating, not going up a hill, not towing, etc), the turbo psi is a essentially 0 below 2000 rpm.

Ethan
Denver, CO

2005 F-250 CC, 6.0 L, 6-speed manual, 4x4, 90K miles
2007 Ford Freestyle Ltd, 30K miles
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1995 Kasasaki Concours (ZG-1000), 30K miles
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post #10 of 13 Old 12-27-2009, 09:59 PM
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There is alot of great knowledge lurking in this forum good luck and have fun

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