- #275 of 391
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Re: What are true Truck MPG's [nimrod75]
by steergazer
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Jan 15, 2008 (10:12 am)
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Replying to: nimrod75 (Nov 24, 2005 9:19 am)
Is it new? My 06 has just under 60,000miles on it and the best I've done with it so far is 23mpg. stock, no tonneau,4x4.
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- #276 of 391
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Re: Buying [mercer3]
by steergazer
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Jan 15, 2008 (10:21 am)
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Replying to: mercer3 (Dec 11, 2005 5:31 am)
I'm on my second one! Had an 02 3/4 ton for 2 years with just over 220,000km's on it did 27mpg with not a dime spent on it besides the regular oil changes. I had to upgrade to a one ton to pull my new horse trailer(rated capacity) It's an 06 still with the 5.9. Not as good on fuel(23 is my best) but power to spare. My gross weight with the horse trailer on, horses on board and all tanks full is just over 23,000lbs and on cruise it doesn't fall below 60mph uphill! Stock! And no troubles so far. I've had this one 6 months now and no issues whatsoever.
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- #277 of 391
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Re: ....are some of.... [ezshift5]
by steergazer
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Jan 15, 2008 (10:37 am)
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Replying to: ezshift5 (Jan 27, 2006 8:29 am)
My 02 quad cab 4x4 3/4 ton with a standard 6 speed would do 27mpg without trying too hard. The best I've done with my 06 one ton so far is 23mpg. It's also a quad cab 4x4 but has the auto trans. Both stock.
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- #278 of 391
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Re: diesel milage [jasper9216]
by fordz1
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Jan 15, 2008 (1:21 pm)
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Replying to: jasper9216 (Jul 17, 2007 5:18 am)
Now that you've had your truck for awhile. What kind of fuel mileage are you getting?
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- #279 of 391
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MPG GMC 06 Duramax Diesel, 3500HD
by 06gmc3500
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Jan 15, 2008 (8:46 pm)
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Is there anyone out there that currently owns a 1-ton dually (3500HD) with the Duramax Diesel and the 6 Spd Allison transmission? What kind of mileage per gallon are you getting? Everything I read prior to actually buying one stated, I could expect mileage in and around 18 to 21 MPG after the initial break in period. Roughly 35,000 miles; I currently have 36,636 miles and at best I am only getting 13.2 MPG. My mileage generally only drops usually between 4 to 6 tenths per gallon when I tow my fifth wheel camper. I can't believe Ford and or Dodge equals (if there is such a thing) are getting better mileage... any thoughts?
GMC= Greatest Mechanical Creation
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- #280 of 391
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Re: Not sure what went wrong??? [jim314]
by jond09
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Jan 16, 2008 (10:16 am)
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Replying to: jim314 (Jan 14, 2008 12:20 pm)
You also need to think about the weight deference between a 20" wheel and tire and the stock 17 setup. This would have a big influence on mpg. If the combination is signifigently heavier you will get worse mpg. Chrysler is more concerned with making all the tree huggers and wimps that don't like to here turbo and engine noise happy than getting you better mpg I can guarantee that. Thats the reason they started putting cats on diesels in the first place to pass emissions. The factory intake has a tube inline that is baffles the air flow to reduce turbo noise but it also is very restrictive, this is the main flaw. If you replace this with a straight through tube and just get the larger k n filter in the stock box or other filter it will make as much power if not more than almost all full intakes. And yes there is no sensor in the exhaust on an 06. Do you have a programmer? What kind? What did you recalibrate you odometer with? Are you going by the factory read out or are you checking your mpg? Because alot of things could effect the read out and throw it of. I have 38" tires with 20" wheels. I check my odometer with a gps. Mine is 15% off. I have an 06 6 speed. As far as your tailgate vs tonneau. Mythbusters don't always bust myths right. It is a proven fact that with the tonneau cover on your truck is more aerodynamic. If you don't believe it put one on and go find yourself a wind tunnel.
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- #281 of 391
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Re: Not sure what went wrong??? [jond09]
by steergazer
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Jan 16, 2008 (11:35 am)
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Replying to: jond09 (Jan 16, 2008 10:16 am)
I don't have a programmer yet. I was unsure about the difference of chips and program before coming to this forum. Lots of good info! I'm thinking of going with the workhorse module. I need to be sure it won't affect my warranty. My dealer said a chip would as they can be detected. I'm not a fan of the black cloud but am understanding this is not the case with a program module. Is this correct? I had the speedo done at the dealer. I check my mpg with a calculator(miles traveled/gallons burned) I drove over 5000miles this Chrismas holiday to visit family. going I had no tonneau, a trike in the box and my slip tank(85 gallon) full. The return trip I kept the slip tank empty, no trike, built a tonneau and did the same for mpg (17-18). As the wheels go, I'm sure there is some difference as it felt sluggish on the start off. After the intake and cat removed it went back to feeling like the 17's. I'm a believer in the tonneau as well as I have proven it on other trucks I've owned. But I do like em too much to take them off!lol Maybe I will try the 17's again for a tank to see how much difference they make but the 20's will win in the end!lol As long as I know it's that and not my intake it'll make it a little easier to take at the pump.
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- #282 of 391
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Not sure what went wrong???
by steergazer
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Jan 16, 2008 (11:39 am)
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I don't know they are significantly heavier as the stock 17's are a steel wheel and the 20's are aluminum. It didn't feel like a huge difference lifting them.
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- #283 of 391
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Re: MPG GMC 06 Duramax Diesel, 3500HD [06gmc3500]
by kcram HOST
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Jan 16, 2008 (3:31 pm)
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Replying to: 06gmc3500 (Jan 15, 2008 8:46 pm)
Give the Chevy Silverado and GMC Sierra Duramax Fuel Mileage discussion a look 
kcram - Pickups Host
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- #284 of 391
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Re: Not sure what went wrong??? [steergazer]
by jond09
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Jan 16, 2008 (9:47 pm)
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Replying to: steergazer (Jan 16, 2008 11:35 am)
I agree the 20's really help the looks of these larger trucks. In my case larger tires and wheels were worth my lose in mpg. If your planning on getting a chip/programmer I would just leave the wheels on. You should gain back 3-4 mpg with the write one with your intake and exhaust. As far a warranty goes you have to remember that no dealer or mechanic likes to do warranty work. The dealer doesn't make money and the mechanics get paid half there normal hours, so there going to be looking for a way out of warranty work. But legally they have to warranty your truck unless your aftermarket accesary was a direct cause of your issue. They cannot just tell you they want warranty any problem because you have a programmer. Chip or programmer I would serouisly consider getting one that has a read out of all your temps or invest in a set of gauges. This will help keep you from killing your motor or tranny. I don't know if you got exhaust or you just took off your cat but I would get rid of your factory muffler too and get a straight through design if you haven't already. This will help lower egts further.
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