Fuel Mileage Gone To He!! - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 9 (permalink) Old 03-18-2011, 02:17 PM Thread Starter
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Fuel Mileage Gone To He!!

Oh no!

Had to haul a cow to the vet's the other day for a C-section (saved the cow and the calf).

Goose-neck trailer loaded with that cow at 80 mph for 50 miles. Darned fuel mileage dropped clear down to 15.9.

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post #2 of 9 (permalink) Old 03-18-2011, 02:48 PM
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That is pretty good.

Factor in the weight, the aerodynamic drag, and rolling resistance.

Many people will be thrilled with that mileage.
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post #3 of 9 (permalink) Old 03-18-2011, 02:57 PM Thread Starter
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Yep,

Gotta love that shallow rear end and the 6-speed.

Another thing I like is that huge fuel tank. Thing seems to run forever on a tankful of fuel.

Had to dump in the exhaust fluid yesterday tho; warning came on at 5700 miles. 'Course, I tow the snot out of 'er, so 'spose it uses a lot of that juice..........

Allan
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post #4 of 9 (permalink) Old 04-04-2011, 07:16 AM
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Originally Posted by Allan In NE View Post
Oh no!

Had to haul a cow to the vet's the other day for a C-section (saved the cow and the calf).

Goose-neck trailer loaded with that cow at 80 mph for 50 miles. Darned fuel mileage dropped clear down to 15.9.

Allan
======================================

I hope I do this well when I start pulling my RV Trailer Mid April.. At slower speed it would have been even better by far I'm sure..
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post #5 of 9 (permalink) Old 04-11-2011, 10:58 PM
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Quote:
Originally Posted by Allan In NE View Post
Oh no!

Had to haul a cow to the vet's the other day for a C-section (saved the cow and the calf).

Goose-neck trailer loaded with that cow at 80 mph for 50 miles. Darned fuel mileage dropped clear down to 15.9.

Allan
Lucky you. I'm barely see 15 when driving on the highway at that speed without a load.

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post #6 of 9 (permalink) Old 04-13-2011, 03:08 AM
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Lucky you. I'm barely see 15 when driving on the highway at that speed without a load.
No kidding. My truck has been losing mileage since the first time I checked it by hand at 3000 miles. Now has 21000 miles and mileage is at 15 running 65 on cruise with no load or tow. I am totally bumming. I bought the truck thinking it would be able to get at least 18 on the highway at 65 to 70.

Any ideas why the truck is steadily losing mileage? I have the 3.31 ratio axles, 285/70/17 tires (stock were 265/70/17) and a ranch hand bumper replacement on front weighs 289. Otherwise bone stock. Mileage just keeps dropping. Any ideas on what to check? Map sensor?
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post #7 of 9 (permalink) Old 04-13-2011, 05:47 AM
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No kidding. My truck has been losing mileage since the first time I checked it by hand at 3000 miles. Now has 21000 miles and mileage is at 15 running 65 on cruise with no load or tow. I am totally bumming. I bought the truck thinking it would be able to get at least 18 on the highway at 65 to 70.

Any ideas why the truck is steadily losing mileage? I have the 3.31 ratio axles, 285/70/17 tires (stock were 265/70/17) and a ranch hand bumper replacement on front weighs 289. Otherwise bone stock. Mileage just keeps dropping. Any ideas on what to check? Map sensor?
More than likely its the dpf getting older and it having to regenerate more.

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post #8 of 9 (permalink) Old 04-14-2011, 03:33 PM
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Any ideas why the truck is steadily losing mileage? I have the 3.31 ratio axles, 285/70/17 tires (stock were 265/70/17) and a ranch hand bumper replacement on front weighs 289. Otherwise bone stock. Mileage just keeps dropping. Any ideas on what to check? Map sensor?
Did you have your speedo/odo adjusted for the new tire size? If not that could explain why your mileage has dropped. With those taller tires you are actually going farther than your odometer is telling you which will lower your calculated mpg.

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post #9 of 9 (permalink) Old 04-15-2011, 11:16 AM Thread Starter
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No kidding. My truck has been losing mileage since the first time I checked it by hand at 3000 miles. Now has 21000 miles and mileage is at 15 running 65 on cruise with no load or tow. I am totally bumming. I bought the truck thinking it would be able to get at least 18 on the highway at 65 to 70.

Any ideas why the truck is steadily losing mileage? I have the 3.31 ratio axles, 285/70/17 tires (stock were 265/70/17) and a ranch hand bumper replacement on front weighs 289. Otherwise bone stock. Mileage just keeps dropping. Any ideas on what to check? Map sensor?
Did you remove that lower air dam when you changed the front bumper? If so, that's where your 3-mpg went. That silly thing is crucial.

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