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Open Roads Forum  >  Tow Vehicles

 > Mileage on new GMC Duramax/Allison

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ksss

Eastern Idaho

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Posted: 06/28/12 10:47am Link  |  Print  |  Notify Moderator

You have a great tow rig. My experience with the DIC on my GM trucks has always been within a couple tenths either way of actual hand calculated.


2006 GMC 3500 CC 4X4 D/A
2013 Fuzion 342
2011 RZR Desert Tan
2012 Sea Doo GTX 155
2005 GMC 5500 CC 4X4 D/A
2012 Chevy 2500HD 4X4 6.0 3.73


bgum

South Louisiana

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Posted: 06/28/12 11:02am Link  |  Print  |  Notify Moderator

You milage will improve after about 15000 miles. My milage got worse with winter blend fuel.

4x4ord

Canada

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Posted: 06/28/12 11:27am Link  |  Print  |  Notify Moderator

I check my "fuel used" meter on every tank and find it to be within 1%. I have checked the odometer against 5 km test sections on the highway and found the truck actually goes 5% further than what the odometer is saying it went. (that is with the original tires which are getting quite worn - so new tires could put it out another 2%) The real strange thing is that the speedometer is out the other way according to Garmin. And even stranger yet is the fact that the Ford has an engineering test mode that can be entered on the DIC. In this mode a digital display of mph is given which does not coincide with the speedometer.


2011 F350 SRW short box 4x4 CC 6.7 PS King Ranch
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nevadanick

Elko, Nevada

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Posted: 06/28/12 02:25pm Link  |  Print  |  Notify Moderator

Kinda arrogant saying the meters are off without knowing for sure isn't it ?

gmcsmoke

Butler

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Posted: 06/28/12 02:39pm Link  |  Print  |  Notify Moderator

nevadanick wrote:

Kinda arrogant saying the meters are off without knowing for sure isn't it ?


This is RV.net where the experts think they know everything and are proven to know nothing.

Beaker

Brevard, NC

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Posted: 06/28/12 03:43pm Link  |  Print  |  Notify Moderator

Strange how hand calculated can never be off! Has to be the DIC.


2008 Silverado 2500HD Duramax
2010 Cruiser 26RK

xaugievike

Chicagoland

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Posted: 06/28/12 03:54pm Link  |  Print  |  Notify Moderator

the DIC on my '06 has generally been pretty accurate....from spot-on to a variance of +- .2 mpg's.


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nevadanick

Elko, Nevada

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Posted: 06/28/12 04:31pm Link  |  Print  |  Notify Moderator

From some of the mileage claims on here i would have to disagree with the hand calc being accurate

jalichty

Lander, Wyoming 82520

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Posted: 06/28/12 05:20pm Link  |  Print  |  Notify Moderator

I just did a hand calc this afternoon and, if the usage of fuel is correct and the miles on the trip are correct, then I got just over 13 mpg. The DIC showed 12.9 at the same time. I would have to assume that the DIC is fairly accurate based on this. I had the same situation on my old 2003 GMC and, until I changed out to bigger tires, was spot on. After I got the bigger tires, only 265s from the old 245s, there was as much as 2.5 gallons difference, always showing better mpg than actual. Didn't reset itself when I put 245s back on it later.


John A. Lichty

Beaker

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Posted: 06/28/12 07:00pm Link  |  Print  |  Notify Moderator

Quote:

I just did a hand calc this afternoon and, if the usage of fuel is correct and the miles on the trip are correct, then I got just over 13 mpg. The DIC showed 12.9 at the same time


Mine is also very accurate.

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