Does anyone have suggestions on how to get better Fuel Mileage??? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 21 (permalink) Old 08-14-2007, 12:06 AM Thread Starter
 
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Does anyone have suggestions on how to get better Fuel Mileage???

Im just over 4400 miles on my new 6.7 and the best I can seem to get is about 11MPG on the freeway with a 12ft cargo trailer. 10.6 on the overhead computer and 10.9-11.0 hand calculated. Im also getting close to the same when Im not towing the trailer.... Does anyone have any ideas??
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post #2 of 21 (permalink) Old 08-14-2007, 01:28 PM
 
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Only a thing your not going to want to hear, Like running a smaller tire. And just wait until you have the truck good and broke in. I was running in the 13-14 range for the first 4000 miles. I'm at 8000 now and i'm getting around high 15's to mid 16s, and i work in the oil patch so my truck is running all day.
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post #3 of 21 (permalink) Old 08-14-2007, 03:25 PM
 
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try towing in a lower gear...like fifth to bring the rpm up. With your bigger tires, you don't need the second OD for towing. You want to be around 2000rpm
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post #4 of 21 (permalink) Old 08-14-2007, 03:28 PM
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Quote:
Does anyone have suggestions on how to get better Fuel Mileage???

Raise your right foot


Airing the tires all the way up usually helps.

07-6.0 4X4 CC Lariat Tow Boss w/36,000 trouble free miles.
CCV-Zoodad-Harpooned, cat delete, otherwise
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post #5 of 21 (permalink) Old 08-14-2007, 04:14 PM Thread Starter
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Quote:
Originally Posted by 444turbodiesel
Raise your right foot


Airing the tires all the way up usually helps.

Okay... smaller tires isnt an option... ! and I just cant do 65... !

Im just hating life right now because Ive always heard the guys talking about how they get 16mpg or 18mpg with their cummins, even while towing...

Hopefully the new edge and some exhaust when they get it figured out will help.....

Until then, I guess Il be stuck with crappy mileage... UGH!
:smoke
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post #6 of 21 (permalink) Old 08-14-2007, 04:26 PM
 
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You can go over 65...just roll into the throttle as opposed to jumping on it.
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post #7 of 21 (permalink) Old 08-14-2007, 04:47 PM
 
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programmer and exhaust should help. it's helped all the non-DPF trucks atleast. but at 4400 miles you are no where near having that truck broken in either. it'll take time and maybe some money for BOMBs!
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post #8 of 21 (permalink) Old 08-24-2007, 03:49 PM
 
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3500 miles and 15mpg hand calc with a GPS yesterday @ 63mph solo.
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post #9 of 21 (permalink) Old 08-25-2007, 03:37 AM
 
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What gears do you have, 4.10's? if so that was probably a mistake, I have the cab chassis and could only get 4.10's with the Aisin 6 auto, I'm averaging 11 mpg hand calced at only 3500 miles and my truck weighs 11,500#, when loaded and towing over 22,000# CGVW, (only maybe 5-10% of the time towing). Plus only about 15% of highway driving
I was bummed when I was getting under 10 with the first couple of tanks but am happier now, one thing I learned is don't kitty foot it, at least with my truck it does not seem to help at all, when I stomp it, the average MPG on the overhead goes up.
If you do have the low gears maybe you could get the higher gears, by far the vast majority of guys here have the high gears in the pick ups from what I've read, with no lack of towing ability.
Good Luck
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post #10 of 21 (permalink) Old 08-26-2007, 10:37 PM
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Quote:
Originally Posted by bigvick
Im just over 4400 miles on my new 6.7 and the best I can seem to get is about 11MPG on the freeway with a 12ft cargo trailer. 10.6 on the overhead computer and 10.9-11.0 hand calculated. Im also getting close to the same when Im not towing the trailer.... Does anyone have any ideas??
Yeah, don't get a diesel equipped with a DPF. On a serious note it looks like we are all stuck in a EPA learning curve, just like the 1970's when smogging first came out. We just have to face it that the new diesels won't be seeing the high MPG numbers like the past. It will obviously get better but not with our model years
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