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In seek of better mileage..

Old 01-31-2012 | 09:30 AM
  #11  
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My old 5.3 I was lucky to get 14mpg, so I could only dream about getting 22mpg on the highway. My DMax I'm getting 24-25 MPG doing 70-73MPH.
Old 01-31-2012 | 09:30 AM
  #12  
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Huh... mine is bone stock, and when i got it i was getting 15.6 around town no problem, and since they switched fuel blends to winter, literally no change in anything but temp and dates, i am now at 14 flat. it dropped within a month. but don't high stalls for daily drivers in the 3k+ range eat more gas? I have been lurking around trying to find out the answer to improve mileage but finally someone asked hehe thanks OP! Just for giggles, since it was cheap i got a drop in K&N filter and its been better with mileage, it brought me up to 14.5 for 2 weeks then i started to like the gas peddle again, but settling down because I know its stock and dont want to shame myself since there are about 3 really good looking Silverado SS's in my general area and a Joe Gibbs down the street... highway though I get around 22-24 not in 4cyl mode and around 65 mph but if theres a decent head wind i drop a few points haha, cant bring myself to lower the truck, since I like driving in snow so much
Old 01-31-2012 | 10:44 AM
  #13  
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Honestly, if you're pushing anything above 18 MPG on the highway be it a Silverado/Sierra or Avalanche/EXT you're making a killing. Most of these series don't see anything near a 20 MPG range. Think of it in a sense of power vs weight ratio to be the easiest.

A cummins is pushing twice a much torque and most GM gas engines from the factory. This being said, beyond the 2500 and 3500 small weight difference. Its takes much less of the cummins available power to start to move/continue moving the truck. With us, its a much different story. Even down to the 6.2 we just can't compete in fuel mileage.

Right now you're also comparing apples to oranges. Really anything related to the specific engine cannot go across the boards of gas vs diesel. No comparison in any stand point. I've done the general MPG swaps and I'm only getting between 16-18 MPG not including hills and weather conditions.

Last, don't always trust your MPG "meter" on the display. The true way to do it is by fuel volume. Which takes some time and needs to be done with either just highway driving or just city driving. If you combine the two your numbers will be altered.
Old 01-31-2012 | 10:49 AM
  #14  
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I lost about 2 mpg on the highway with 1 3/4" catless LT's after the retune.
Old 01-31-2012 | 10:58 AM
  #15  
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Originally Posted by BrutalSierra
electric fans!
Its a 05... It has them already
Old 01-31-2012 | 11:12 AM
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Baby cam to increase torque at low rpm, stock converter, stock manifolds & y-pipe with a retune. Light wheels & tires, lower the truck a little, and anything else that will lower the drag coefficient.

Driver mod. Read up on hypermiling.
Old 01-31-2012 | 11:23 AM
  #17  
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Skinny light wheels and tires, reduce weight as much as possible, good tune, bed cover, check your brakes to make sure none are dragging, and make sure all wheel bearings are in good shape.

Basically, reduce drag as much as possible.
Old 01-31-2012 | 12:18 PM
  #18  
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WTF!! i get like 16-18 highway and like 12.5 city would a tune help
Old 01-31-2012 | 01:23 PM
  #19  
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Originally Posted by La SS
WTF!! i get like 16-18 highway and like 12.5 city would a tune help
Your also AWD and a 6.0 and im a 5.3 and 2wd....
Old 01-31-2012 | 01:32 PM
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I find this hard to believe....can I borrow your truck?

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