What gives!!! MPG AGAIN - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 20 (permalink) Old 12-16-2007, 04:11 AM Thread Starter
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What gives!!! MPG AGAIN

Well fellas got the odo up to around 2300 miles. The best i ever saw was 12mpg, which was hard to accomplish. I towed a 30 foot Weekend Warrior about 60 miles or so, down to 11.4, not bad. Towed it again for 25 miles and now down to 10.8. I drove it a few easy hundred miles between trips and the mpg still continues to drop.
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post #2 of 20 (permalink) Old 12-16-2007, 03:27 PM
is here and there.
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Ok, I took all off- topic posts out, which left NOTHING but the original post.

If you do not have a suggestion to help the original poster with HIS truck, don't post.

Guys start helping posters, don't brand bash, smack talk or make smartass comments about ANY truck. The crap going on in the 6.4 forums has got to stop. :rules:

Life changes, so roll with it, not against it.
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post #3 of 20 (permalink) Old 12-16-2007, 03:44 PM
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I feel ya, but it seems to be a hit or miss thing, average mpg's or bad, but look, unless you've missed a zero, 2300 miles is not broken in yet, just wait on it it'll get better, or just do what my dad does, figure out how to write it off as a business expense....
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post #4 of 20 (permalink) Old 12-16-2007, 03:50 PM
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I thought I was getting only around 7-8 per Canadian gallon until I read a couple of days ago that the filler kicks off about 6 gallons short of a full tank. I tried the slow fill and got a heck of a lot more fuel. Which so far is on a par with around 13 mpg which makes me feel a lot better.Guess I should have been paying better attention.

This is one of Fords TSB's regarding fuel economy.

6.0/6.4 Fuel Economy:
Ford vehicles equiped with the 6.4 PowerStroke diesel are not rated for fuel economy by the EPA. If economy is in question, a boost test should be performed. If boost reaches 22-25 PSI in third gear, wide open throttle under load, then the engines operating normally and no economy related repairs need to be performed. If not in specs, then the engine will need to be diagnosed--check sensor reading, VGT and EGR operation, fuel pressure and quality, crankcase pressure, intake or exhaust restriction, exhaust or CAC leaks.
Fuel economy will be affected by many factors, including: excessive idle time (one hour equals approxmately 33 miles of driving), fuel quality and blend, ambient temperature, driving habits, vehicle use, towing, loads, add-on accessories. Broadcast Message 1271, 4450, 6989

I tried this and mine appears to be working fine. I have just under 6000 miles on my truck. I definitely noticed an improvement as I got a few more miles on the engine. Hope this helps.
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post #5 of 20 (permalink) Old 12-16-2007, 04:29 PM
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i know my MPG went up as i got more miles on the truck... and then it went right back to where i started... I wonder why...hmmm...haha

So just wait it out man it will get better! and just remember the truck is worth it cause it looks damn good rolling down the road!

B.O.M.B. SQUAD #67

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post #6 of 20 (permalink) Old 12-17-2007, 12:51 AM
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My 08 6.4 Crewcab, 4x4, 3.73 rear gear, 10,000 miles, around town now up from 13.9 to 15.0 - still in the 10's when towing my 7000# travel trailer.
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post #7 of 20 (permalink) Old 12-17-2007, 05:41 AM Thread Starter
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ah, thanks guys.
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post #8 of 20 (permalink) Old 12-18-2007, 09:38 PM
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Winter Diesel is cut with #1 Diesel(Kerosene). So the fuel you are buying has a less BTU per Gallon. This is done to prevent the fuel from Gelling in your fuel system. I have lost about 2 mpg with winter fuel. Ford Diesel are a heavy truck and it takes a lot Fuel to get them moving. We did not buy theses trucks believing we would be getting good millage.

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post #9 of 20 (permalink) Old 12-19-2007, 12:26 AM
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New Rear Axle Option on Job 3 Trucks

I am shopping a replacement for my 2005 6.0 and putting together a special order.

My dealer tells me a new 4.x axle is coming up that will only work with the 18" wheels that should boost fueld economy a bit.

I have 18" wheels on my 2005.

Regarding the 20" wheels, what is everyone's opinion on how they effect fuel economy?
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post #10 of 20 (permalink) Old 12-19-2007, 04:48 AM
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4.10's and 20" wheels should both lower your fuel economy

2008 Red CCSB 6.4 Auto Lariat.
Stock 20's wrapped in 35x12.50R20 Toyo MT's, 3.73 gears, Nav, Backup Cam, Tailgate step, Upfitters, etc.
Mods: AFE Intake, Line-X, 20% Tint, Clear Bra, Husky Mats, Smoked Recon Mirror markers/3rd brake light, Bushwacker Pocket style flares w/ mud flaps + an aluminum Rapid Hitch (one of the best investments!)
Feel free to PM with any questions about any of my mods.

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American Club #55

Last road trip-567 miles @ 20.7 mpg @ 67mpg average speed.
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