- #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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- #285 of 391
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Re: 45 CETANE FUEL [fordz1]
by steergazer
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Jan 17, 2008 (7:18 am)
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Replying to: fordz1 (Nov 21, 2007 5:08 pm)
I saw on one forum on another site that adding pure acetone to the fuel at a rate of 2oz per 10 gallons increased the mpg by 3-5. Anyone else have input on this? It actually had a video. I'll try and find it again and post the website on here.
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- #286 of 391
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Re: Not sure what went wrong??? [jond09]
by steergazer
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Jan 17, 2008 (7:38 am)
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Replying to: jond09 (Jan 16, 2008 9:47 pm)
I'll definitely get a pyrometer and tranny temp gauge if I go with a chip. Problem with removing the muffler is that I'm not a fan of the louder sound. I've also talked with guys who said they get a drone as well? Is there a muffler available which increases air flow but doesn't sound like the beast has been unleashed?lol I like the sleeper type of truck. I love that when I stop at a light and a tuner pulls up next to me that I beat it off the line! And I'm driving a one ton!lol And no cloud of black smoke or loud noises show it's a stock truck. At the second light I usually get a look of disbelief!lol I've never had a chipped diesel and can't imagine how it must feel when my stock truck already impresses the hell outta me! I just had the cat removed as it already has a stock 4" all the way from the turbo.
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- #287 of 391
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re: MPG on 08 seirra 3500 hd deisel
by acapaldi
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Jan 17, 2008 (11:03 am)
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bought in september was getting around 14 mpg broke down within 20 days of having it. They flashed it and was at 12 mpgs. droke down agian week after and flashed it agian (mind you still did all the oil changes that were required by manuf.) went down to 11 mpgs. broke down agian the shop had it for a whole month when i got it back i was at 10 mpgs. spoke with the area rep and we worked out qa deal so they could figure out the problem and still no change other that i am at 8 mpgs. also they put a tat tail in my truck and i ran it for 3 weeks and they are stating that everything is in the proamitors. but my mpgs stayy the same either in the city or highway. i need some help please
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- #288 of 391
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Re: MPG GMC 06 Duramax Diesel, 3500HD [06gmc3500]
by acapaldi
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Jan 17, 2008 (11:06 am)
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Replying to: 06gmc3500 (Jan 15, 2008 8:46 pm)
hi i have a 08 3500 hd and i have had it since sept. 07 amd i have broke down 3 times and i am only getting 8 mpgs was wondering what you were getting
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- #289 of 391
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Re: Not sure what went wrong??? [steergazer]
by jond09
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Jan 17, 2008 (12:29 pm)
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Replying to: steergazer (Jan 17, 2008 7:38 am)
I agree the stock 4" exhaust is pretty good. I just remove my cat as well and put a magneflow muffler in place of the stock one. I think it sounds good, not to loud at all for me. It really didn't get much louder, just a better sound. Got it of ebay for $75. The stock muffler is very heavy and veeeerrrryyy restrictive. If your impressed with your truck now, you won't believe it when you get a chip. I also love messing with the tuner cars. They really fell bad then since I'm running 38" tires and I can still smoke'em.
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