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Old 10-22-2008, 07:07 PM   #37 (permalink)
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Quote:
Originally Posted by hank22802 View Post
I have an 06 2500 5.9L and according to the computer, I am getting 26.1 mpg. I know that probably ain't true, but I am getting about 350 on half a tank. I have installed the S & B cold air intake, and downloaded economy performance diablosport tune. I also have the 3.73 gears.

correct me if i'm wrong but these trucks have 35 gallon tanks and if ur gettin 350/ half or approx 700/full tank ur gettin right at 20mpg.
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Old 10-22-2008, 07:47 PM   #38 (permalink)
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correct me if i'm wrong but these trucks have 35 gallon tanks and if ur gettin 350/ half or approx 700/full tank ur gettin right at 20mpg.
I think the gauge on the '06 reads wrong. 65-70%% of my miles come from full to half. I don't think it's the true half way point unless it has fuel well below empty.
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Old 10-22-2008, 10:09 PM   #39 (permalink)
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15/16 city 20-22 highway

Driving real conservative I'm getting 15/16 city 20-22 highway, 26,000 miles daily driver w/ no towing/hauling.

Very little soot on bumper and really haven't seen a big jump in mpg as truck breaks in. Keep a log of every ounce fuel/etc. that goes in truck and the type of driving (city/highway/etc.) on each tank. Paid $2.89/gal on last fillup, which is considerably better than the $3.75 I paid the time before.

Don't know what to suggest for you. Keep careful records and let the dealer know you're concerned about your performance.
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Old 10-22-2008, 10:45 PM   #40 (permalink)
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Tommymo: I bought my truck brand new and thought I would be getting all this great gas mileage too. I was very disappointed when I was only getting 11 and 12mpg all stock no towing. 26,000 miles later and a couple mods to help it breathe in and out, I'm up to 15 even 16 being good. Don't take your truck in just yet. Put some miles on it. I've been told that even w/my mileage the motor isn't broke in completely. Maybe I'll get a couple more per gal. in the next yr.
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Old 10-23-2008, 09:44 AM   #41 (permalink)
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So are there any mods I can put on the truck which will increase my MPG and not void my warranty? Do these mods come with a cost to any other performance features such as power, torque, etc?
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Old 10-23-2008, 10:19 AM   #42 (permalink)
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not really anything you can do w/o voiding warranty to give you noticeable mileage. just took my cousins filters and all out from under his 07 and he gets 4.5 more mpg hand calc. then came a chip, another 2.3 mpg hand calc. so he's up to about a 7 mpg increase with just those two but he's got 38k miles on it, so if they want to the dealer could void his engine warranty, i think.
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Old 10-23-2008, 10:29 AM   #43 (permalink)
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Being the engine isn't broken in yet it would be understandable that the mileage is sub prime. However owning a Cummins that passed the 200k mark sometime ago i can honestly say i get the best fuel mileage by slowing it down to around 55mph in 6th gear. I wouldn't want to tow this way, but for cruising down the highway unloaded it does wonders for the mileage. Mine is a 3500 CC SLT and i have seen 19-21mpg keeping it at 55mph.
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Old 10-23-2008, 10:36 AM   #44 (permalink)
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Quote:
Originally Posted by Suprcynic View Post
I think the gauge on the '06 reads wrong. 65-70%% of my miles come from full to half. I don't think it's the true half way point unless it has fuel well below empty.
I second that. I tested it one day when I filled up with barely anything left in the tank. I put a total of almost 34 gallons in the tank, and when it read halfway on the gauge, i had only put in about 14-15 gallons. So it's a little off. Not to mention, I notice my gauge hangs on half tank for a long time and then rockets down to E. Just my $.02. Can't really trust the overhead OR the fuel gauge. Get an after market if you really want to track it. Otherwise, just be happy that diesel fuel is on its way down.

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Old 10-23-2008, 11:08 AM   #45 (permalink)
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With all these mods available, is there any risk of doing harm to your engine? There seems to be so many chips,intakes,exhaust etc on the market? How does some one make sense of all this?
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Old 10-23-2008, 11:31 AM   #46 (permalink)
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With all these mods available, is there any risk of doing harm to your engine? There seems to be so many chips,intakes,exhaust etc on the market? How does some one make sense of all this?
I would say you cant go wrong with an after market intake and exhuast. Anything that flows air better is going to make your engine more efficient. Where it gets hairy is after market chips and programmers. I got the smarty jr cuz i didnt wanted safe power that would require bigger injectors/bigger fuel pump/trannyupgrade/etc. Too much fuel, unless you upgrade other parts in your engine/transmission could do some damage. But Im sure other guys will chime in that have more experience at the high fuel end of things. I just went for safe power and higher mpg's.
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Old 10-23-2008, 11:41 AM   #47 (permalink)
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Yeah, like mentioned above....if you add enough fuel, and or not enough air, and too much fuel, you can do some major damage!! For the basic mods though, like intake and exhaust, you are safe. If you wanted safe power, look into electronics like the Smarty Jr., that dont add a lot of power.
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Old 10-23-2008, 12:15 PM   #48 (permalink)
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what are the differences on mods with respect to air intake? What makes one better then the other?
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