Really!!!
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Senior User
Joined: Jul 2005
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From: California
Really!!!
I usually drive very short distances to and from work or I am driving up and down local mountain roads. When driving around i normally get around 14 mpg which i think is actually pretty good for the weight of this truck and the fact that i dont drive really slow! Well yesterday our family drove 120 miles on flat road keeping speed around 80 mph; when we arrived I checked mileage and to my surprise it was 19.1. I am a happy camper and still loving my truck everyday. Hope you all are enjoying yours as much as I am. 
Post Fiend
Joined: Oct 2002
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I have an idea about mpg drop after a bit of ownership....
I think, like all other mpg factors, that driving style is STILL the biggest variable...
i.e. when new, you are learning the truck and maybe even driving it easier than you normally would,
then as you get 'used' to the truck, you start driving it basically like it's no longer a new truck and DRIVING
it then becomes an appliance that you just USE and abuse ! YRMV
trust me, am tickled pink over the mpg this 12 gets as compared to my other diesels,
but I certainly didn't buy it for the mpg
I think, like all other mpg factors, that driving style is STILL the biggest variable...
i.e. when new, you are learning the truck and maybe even driving it easier than you normally would,
then as you get 'used' to the truck, you start driving it basically like it's no longer a new truck and DRIVING
it then becomes an appliance that you just USE and abuse ! YRMV
trust me, am tickled pink over the mpg this 12 gets as compared to my other diesels,
but I certainly didn't buy it for the mpg
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Senior User
Joined: Jul 2005
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From: California
I have stock 20" rims and tires with 3.73 rear end. Yes driving style is the biggest factor I believe. During this trip I was watching the little green mpg meter and feathering the throttle to really see what I could push our of her without sacrificing speed!
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Lead Driver
Joined: Nov 2005
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From: Kaysville Utah
You mean 3.55. You can only get the 3.73 with the dually and they don't come with 20" wheels
I've driven trucks with both the 3.55 and 20" and trucks with 3.31 and 18's, I get about the same mileage at 80 mph with either. The taller tires on the 20" rims make up for the stiffer gears with the 18's
I've driven trucks with both the 3.55 and 20" and trucks with 3.31 and 18's, I get about the same mileage at 80 mph with either. The taller tires on the 20" rims make up for the stiffer gears with the 18's
Tuned
Joined: Jan 2011
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I usually drive very short distances to and from work or I am driving up and down local mountain roads. When driving around i normally get around 14 mpg which i think is actually pretty good for the weight of this truck and the fact that i dont drive really slow! Well yesterday our family drove 120 miles on flat road keeping speed around 80 mph; when we arrived I checked mileage and to my surprise it was 19.1. I am a happy camper and still loving my truck everyday. Hope you all are enjoying yours as much as I am.
Posting Guru
Joined: Apr 2011
Posts: 2,345
Likes: 0
I have an idea about mpg drop after a bit of ownership....
I think, like all other mpg factors, that driving style is STILL the biggest variable...
i.e. when new, you are learning the truck and maybe even driving it easier than you normally would,
then as you get 'used' to the truck, you start driving it basically like it's no longer a new truck and DRIVING
it then becomes an appliance that you just USE and abuse ! YRMV
trust me, am tickled pink over the mpg this 12 gets as compared to my other diesels,
but I certainly didn't buy it for the mpg
I think, like all other mpg factors, that driving style is STILL the biggest variable...
i.e. when new, you are learning the truck and maybe even driving it easier than you normally would,
then as you get 'used' to the truck, you start driving it basically like it's no longer a new truck and DRIVING
it then becomes an appliance that you just USE and abuse ! YRMV
trust me, am tickled pink over the mpg this 12 gets as compared to my other diesels,
but I certainly didn't buy it for the mpg
I have 6500 milesand have lost 2mpg, I dont drive harder and my 6.0 was better.
Cargo Master
Joined: Jul 2008
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On the open road I can get 19mpg on a good day. That having been said, as soon as I get off the highway and in to some stop/go areas the mileage drops off. Same goes for regen cycles.
My overall average is 17.1mpg. On a regular day I am right around there - 16.5 to 17.5.
A head wind will make a big difference, as does a tail wind. It can make the difference between 19mpg and 14mpg.
My overall average is 17.1mpg. On a regular day I am right around there - 16.5 to 17.5.
A head wind will make a big difference, as does a tail wind. It can make the difference between 19mpg and 14mpg.
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Joined: Jul 2005
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From: California
Update- just got back home. Not a long trip by any means but here are the stats. Trip was 286 miles, 218 highway the rest around town here and there mostly 5-6 mile drives. There dic said 19+ dropped down to 15.9 around town. Heading home strong headwind i would say around 20 mph drove at 70-75 mph. Arrived home dic said 16.4. Hand calc trip at 16.6. I am one happy camper and actually got some seat time in my beast!
Senior User
Joined: Feb 2007
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From: Colorado
I went up to Winter Park from Col Springs, some long climbs and switchbacks up to Berthoud pass, not a long ways away but got 19.2 MPG as calculated by the truck. Wow, pretty amazing, and the short climbs up seemed effortless as compared to my 07 6.0. I need to take a level road trip somewhere to see if it climbs higher.... the truck and I like to stay in the mountains.
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