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Chevy Silverado and GMC Sierra Duramax Fuel Mileage

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Comments

  • losman54losman54 Member Posts: 22
    I think you're right GM is screwed. Rumor has it that GM is going to change the 6.6L Duramax, Right now is not 2010 compliant...Dodge Ram BTW is, and if GM can't meet or come close to the MPG's your mega cab is getting now...Dodge is going to win out. There are rumors out there that Dodge Ram (re:4500) is going to make changes to improve what they have out there today i.e. lowering the rear axles ratio. I'm of the mind set that says "where there is smoke there is fire"...there are too many rumors out there...so my buying decision is on hold. If my 2002 duramax which got me 11.5 - 12.8 towing 16.5K 5th wheel died (currently have 129K miles on it) and I had to get a truck. I would get the Ram 4500, standard with exhaust brake, large brakes, 52 Gal tank and 17 MPG around town. I do wish Dodge Maga Cab came with a full size bed instead of a 6 foot bed.

    GM - has a lot of issues to work out, and if I were them...I would come out with a statement on what their plans are if they don't want to lose full size market share.!
  • captbillycaptbilly Member Posts: 2
    If it sounds too good to be true....it probably is.

    You can clean your injectors but after that, it is hard to gain enough economy from a tank of fuel to cover the cost of the additive.
    Bottom line...If you want excellent fuel economy buy a little hybrid car. If you want a big ole chevy truck for work- pay at the pump.
    I gotta go...my truck is running.
  • eliaselias Member Posts: 2,209
    many tdi geeks report slight mpg increase when adding powerservice or other lubricity additive. could be the placebo effect.
    i've certainly noticed smoother TDI operation & startup in winter when I use the winter/whitebottle poweservice but i didn't bother with it even during subzero temps last winter.

    haven't any of the diesel/truck mags done tests with the new duramaxen on the track at 65 mph with modded software / disabled fuel-wasting "regeneration" ? wouldn't it be an easy test? well, easy for me to say! :)
  • losman54losman54 Member Posts: 22
    Johnny...please leave all of us alone ...get a real job or go find yourself a street corner to sell your stuff and stop trying to sell this stuff to people who don't care.
  • rbb39rbb39 Member Posts: 1
    I am looking to purchase a truck soon, and I dont know what to buy. I am looking at maybe an 05-07 Duramax 2500HD 4x4. Anyone know of any mechanical or recall problems that these trucks have had. What about fuel mileage, good or bad?
  • maddogmurfmaddogmurf Member Posts: 3
    I just had the ECU update put in my 07 sierra, 2500HD, long bed crew cab. Things were all geeked up on the mileage indicator etc after I went from 245 (5ply) to 265 (10 ply) tires. The dealership stated they would not update the computer for the increased tire size.....tough on them at least I will get a few more miles out of the warranty as I'm going to go to 285s real soon, the 10 ply helped immensely with ride under load. I drug a 15,000 lb load 800 miles and got 18 miles to the gallon.....I was sweating as the fuel consumption stated that it was using way more than it was with the new tires.....but the fuel performance is sometimes great, sometimes sux though I have never gotten less than 16 without a lod or 11 with a 15-20,000 lb load.....best time to drive and drag a load is definitely at night when it's cool. In the heat of the day with a head wind it can definitly chow down on the diesel. I've gone from Colorado Springs to KC on 30 gallons of fuel and another time made it to Hayes on 3/4 tank, then from Hayes to Joplin on 2/3 tank and changed nothing except lost the head wind and day went to night.....we'll see how it operates with the new ECU update. I did get a Diablo chip for it but I have to do some tests, like install it properly. The guys who put it in initially didn't follow the instructions.....was not impressed as the truck got noisy with the 80HP boost and acted goofy with the 60HP boost....but bottom line, it wasn't installed properly.....so we shall see.....yea I know about warranty issues and chips......but someone purported better mileage with the chip if you keep your foot out of it. I also found by changing the fuel filter at 50% life and cleaning the K&N at the same time helps as well.....that could be why I got such great mileage with a load on this trip. Even with 26000 miles it runs quieter than any other truck next to it......and ain't had a sports car yet take me off the line. It does ride like a Cadi, run and handle like a porsche, and work like a truck.
  • maddogmurfmaddogmurf Member Posts: 3
    I have gotten as high as 22mpg. Just had an ECU update and got 18 plus MPG over 790 miles with a 15,000 lb load.....go figure.....the mileage is a weird creature on the duramax.....I have gone to replacing the fuel filter at 50% and cleaning the K&N at the same interval......I also change the oil at 100 hours, 3,000 miles or 30% oil life left, which ever comes first. I have noticed better mileage tends to occur with night driving when the temps are cooler.
  • maddogmurfmaddogmurf Member Posts: 3
    I bought my 07 in June 07.......I love the truck.....pulls the mountains here in Colorado as though it were on flat ground.

    At first the mileage sucked then after about 10000 miles things began to improve.

    To date I have gotten as high as 22 on the highway (I-70) doing the speedlimit of 75-65. Never gets above 2000 rpm at 75 mph except when accelerating.

    I have had really bad fuel performance with a head wind. I have gotten as little as 11 MPG with a 15-20K load. This last trip though I had at least 15000 on and got 18 MPG after upgrading to 265 10 ply tires and having the dealership install the new ECU updates. I had to keep track of fuel consumption after switching to the 265 tires as the dealership will not update the module for me for the new tire size.

    The jake brake works awesome. The thing tows like there is no tomorrow and runs like a sports car, rides like a Cadillac as well.......I bought a Diablo chip and the jury is still out as I found that the guys didn't install the chip correctly. Air bags are a must for big loads.....I wonder just how much it would tow as I have had some loads on it and it just keeps going whether sea level or mountains......

    I did find that a new fuel filter at 50% fuel filter life.....cleaning the K&N air filter at the same interval, and changing the oil at 30% life remaining, 3000 miles, or 100hours (whichever comes first) also helps. Long trips go better at night and I'm hoping this last trip with a load is an indicator of future fuel mileage performance.
  • evandermevanderm Member Posts: 1
    Hello my name is Evander, I myself just bought a 01' Duramax and i have the same exact problems... Im Furious i even noticed some blue smoke coming from exhaust and the mechanic said its all due to my fuel injectors. I do not have the $4,000 to fix what they are saying is the prob.So if you find out something new would you please contact me personlly.evandermartinez@yahoo.com And theytold me that the extended 7yr warranty expired on 5-11-08 other wise they would warranty it ..
  • jmcgoffjmcgoff Member Posts: 1
    I recently bought a 2007 Silverado Duramax with a utility bed on it. I have been averaging 10 mpg in the city and 15 mpg on the highway not towing anything. Its under warranty but the dealer couldn't find anything wrong. Has any one come across this same problem
  • richardbrichardb Member Posts: 9
    10K miles I am getting 16,2 MPG in town driving. Mountain/highway driving getting 17.5 MPG. These numbers should be on an EPA sticker on all trucks for comparison! Trailer towing (27 ft - 8000 LBS) 10-12 Mpg - varied driving. This is a 50% increase in mileage from my Ford 10 cyl with more power. Diesel is currently 25% more where I live. So some savings in fuel.
  • losman54losman54 Member Posts: 22
    After many months of researching the next truck I was going to buy, I decided to stay with Duramax and the Allison combination. I needed a truck to be able to tow 16.5K plus and all of the dullies GM, Dodge and forget Ford ( I would get a F450 if you paid me, not with all the troubles that truck is having) I decided to get a GMC Topkick custom built by Monroe Truck Equipment. It has all the bells and whistles...330 PH with a 6 speed trans...I'm getting 14 MPG around town and 17 on the Hwy, which is too bad considering the truck weighs 9,000 plus pounds. The air suspension cab air ride and the air cushion seats are a must, and it came with an 8ft pickup bed. How prefect is that! I love the truck, it turn sharper than a Honda Civic and it's the same length as my old Silverado extended cab.
    There are several of these truck for sale out there, you just have to look for them...and the people selling them are anxious to make deals, that's if you need tow anything heavier than 16.5K.

    I figure that I keep this truck for several years ans then see what GM and or Ford have to offer. Ford will by that time have their act together with the F450 ...they'll have their own engine in the truck and maybe GM is they're still around will put out a production model of 4500 truck in off the line HD pickup.
  • jerrydockjerrydock Member Posts: 29
    There is nothing wrong with your truck. Some get better mileage than others and some need to get over 20,000 miles on them before they begin to improve. I have over 50,000 on mine now and switching to Amzoil synthetic diesel grade oil helped get another 1-2 mpg. Good luck. Enjoy the truck and stop pestering the dealer; their mechanics don't have a clue anyway.
  • pete59pete59 Member Posts: 6
  • pete59pete59 Member Posts: 6
    My first post was back at #312. I asked about fuel mileage on a long bed two wheel drive diesel with the Allison tranny. Since then I purchased a 2008 Silverado four wheel drive crew cab. I am commuting the 110 miles a day as stated back then. I was hoping to get at least 20mpg to match my old two wheel drive Ford and hopefully better down the road after break in. My commute is about 30 miles of hills and 20 fairly flat. Most days I get right at 20 mpg. Some days a little worse but I have found it seems to make a difference as to the fuel you buy and humidity or rain seems to make a difference also. In the summer I trailed a 16 foot boat behind my 30 foot fifth wheel. On the average ( Interstate ) I got 11.5 mpg. I now have about 20,000 miles so it still early.... I am a moderate driver and stay close to the speed limit. It's amazing how much you watch the instant on-board MPG. and how it effects my driving habits.
  • axle1axle1 Member Posts: 10
    Is the LB7 duramax motor better than the LLY motor. From my experiences it is far better.
  • jbull454GMCjbull454GMC Member Posts: 20
    I have recently purchased a 2008 GMC 2500HD with a Duramax. I have to admit, at first the mileage was not good. Roughly 14 mpg around my normal driving range. and about 17 on the highway. I work for a Chevrolet dealership. (No I did not but a chevy, I think the GMC looks better) I looked up the trucks history on a GM web site. I found it had been sitting for a year. Upon finding this out I changed the oil the following day. I noticed about a 1-1.5 mpg increase. Also as I have put miles on the truck I have noticed the power increase. Therefore break in is a big thing with this engine. I've seen that keeping the RPM's below 2000 in normal driving help alot too. I did get about 21 mpg on a small trip I took with it on the highway after changing the oil also. I am switching to Amsoil at about 10,000 miles to see how it does there. There is one thing I have noticed that makes the fuel mileage drop drastically, and that is the regeneration system for the particulate filter. The mileage dropped to between 12 and 13 mpg. Thank you federal government for that...Any input on MPG tips would be greatly appreciated. Also if anyone wants to know any thing about their GM truck feel free to contact me. I look forward to reading more on this site.
  • jbull454GMCjbull454GMC Member Posts: 20
    I work for a chevy dealership. As for the 05-07 duramax no recalls, as the older models had an injector recall. The newer models seem to be doing fairly well so far as for repairs. Mileage is about 15-20 depending on driving. Stay away from the new body style 2007 and a half on up. They do not have the particulate filter which as a regeneration system that activates to burn off the soot build up. When this occurs mileage drops considerably. I have a 2008 GMC and I've been down this road with it. Good luck with your search!
  • losman54losman54 Member Posts: 22
    I agree I like the looks of the Sierra a lot better than that dumb chrome over plastic front bumper. I'm interested in knowing what kind of Amsoil oil are you using in your Duramax. I just traded my 2002 Silverado and got a new GMC Topkick and I'm getting 13-17 city/hwy not bad.

    One thing that I had in my Silverado that I would recommend is a K&N air filter, it will add 10-12 HP, and as you know your will get better MPG with more HP, and colder air. It's pricey but it's the last you will have to buy! :)
  • jbull454GMCjbull454GMC Member Posts: 20
    That bumper is what really turned me off. I will probably be using 5W40 Amsoil. It, right now, is the only one formulated for the new LMM engine. I don't know if K&N offers a filter for the LMM engine. The current filter that comes factory is made by Donaldson. Donaldson is recomended by Amsoil actually. I'm not sure I want to add any more power to that engine! It could get me in trouble as it is, and its getting quicker with break in. I will definely keep that in mind though. Thanks!
  • losman54losman54 Member Posts: 22
    you can go on to their site and enter yr/model and if they have one it will come up. THX for the info on the Amsoil...have you seen any MPG as a result of using Amsoil?
  • jbull454GMCjbull454GMC Member Posts: 20
    Okay, I'll give it a look. Thanks for the info there. As for my currant truck I have not put it in yet. Its not boke in. As for other trucks, which were all gas, yes. Believe this or not. I have an 86 Chevy crew cab dually, 454, 4 wheel drive. I got almost 16 miles to the gallon on a trip to North Carolina with it. It wasn't my idea to take it, that was a now ex's idea. Plus my other vehicles I have put it in have increased in mileage too. I am looking forward to see how it does in my Duramax.
  • losman54losman54 Member Posts: 22
    I will have to check but I suspect that you are not going to be able to run synthetic oil in a diesel. I'm open to comments
  • jbull454GMCjbull454GMC Member Posts: 20
    I'm going to do more research as well. I still plan on giving it a try. Right now I use Rotella. Everything I've heard and read its the best conventional oil on the market for a diesel. I would like to know if anyone else has any insight on synthetic oils in a duramax too. Let us know folks!
  • losman54losman54 Member Posts: 22
    I just did a quick Google search and I was pleasantly surprised to see the following:
    http://www.oilsandlube.com/dieseloil21.htm
    Based on what this says...I'm willing to give it try after I ask to see if it would void any warranties.
  • losman54losman54 Member Posts: 22
    You know I must of just taken a stupid pill! I just remembered that my wife's Jetta diesel gets synthetic oil every 10K miles,,,btw...we get 48-50 MPG
  • jbull454GMCjbull454GMC Member Posts: 20
    That is an interesting site. Being an Amsoil preferred customer I do get literature on their tests. The wear tests are very impressive. They also have several fuel additives for diesels too. If you look further in to Amsoil look at becoming a preferred customer also. It will save you a lot in the long run. Especially if you start using it other vehicles. I was changing oil on 8 for a while. Conventional oil was costing me on that. I switched to Amsoil and their extended service oils...I saved $700.00 in oil changes alone. Plus the fuel mileage increases, but as I said before it was on gas engines. After looking at what that site says about rotella I might use a different conventional oil too.
  • losman54losman54 Member Posts: 22
    http://www.performanceoiltechnology.com/DuramaxDiesel.htm

    "Chevrolet Duramax Diesel Owners

    Learn about AMSOIL synthetic motor oil from experienced Diesel Truck Engineers and Lubrication Specialists right here in the auto and truck engineering and manufacturing capital of the world- Detroit, Michigan.

    We are diesel engine, powertrain and chassis experts and are here to help you achieve optimum performance and longevity from your truck.

    You've spent your hard earned money on the Duramax Diesel option in one of the most popular and well engineered trucks there is, now don't you think you owe it to yourself to use the very best oil in it? And don't let your local dealership service center tell you that you you have to use their brand of oil to "maintain your warranty". That is a false statement by the dealership, yet it goes on day in and day out. We constantly receive calls from customers that were told this by their servicing dealership. This practice is not authorized or condoned by the auto manufacturers, but the fact is it still goes on.

    How a servicing dealership can essentially tell a customer that they have to use a lower quality oil than AMSOIL to "maintain their warranty" is not only wrong but it is also illegal unless they provide it free of charge. There are Federal laws that protect you against this. Please read our Warranty Laws You Need to Know section of this website to learn more or send us an email.

    Take a look at the varnish deposits in this picture below. These are the results of a severe high temperature deposit test. The one at the far right is AMSOIL Synthetic 15W-40 Diesel oil and the others are major brand petroleum diesel oils. (left to right: Chevron Delo 400, Cummins Premium Blue, Shell Rotella T, AMSOIL 15W-40). The test clearly shows that AMSOIL keeps engines cleaner longer than other major brand diesel oils do. Which oil would you rather have protecting your engine?"
  • jbull454GMCjbull454GMC Member Posts: 20
    That is even more interesting. I need to dig deeper in to their web site. I'm a customer, I should! lol I know if you plan on keeping your vehicle for any extended time their bypass filters are a wise investment also.
  • madbrit427madbrit427 Member Posts: 11
    I have a 2004 model and am starting to get injector problems, so I am interested in that recall that "jbull454GMC" is refering to. They have replaced one under warranty but the truck still smells of unburnt diesel fuel. The engine surges when driven under 1500rpm too. Apparently the extended warranty company (GM) will not pay to replace all the injectors which the dealership wanted to do.

    Plenty of power, always did even with the first really bad injector. A few other niggling complaints of sticky steering when first started and turning out of a parking space and that damn rattle from the steering shaft even after they replaced it.
  • losman54losman54 Member Posts: 22
    I dont know if this helps but, I had a 2002 and I got a letter from GM extending the injectors out another 100K ...a total of 200K...maybe tat was just for that truck year of 2002.
  • jbull454GMCjbull454GMC Member Posts: 20
    They have extended the warranty on the injectors. You will need to get with your dealership on that. If there is a hassle I would concider calling either Chevrolet or GMC customer assistance depending on what you have.
  • MichiganMaxMichiganMax Member Posts: 2
    I run Amsoil 15-40 In a 2002 Duramax CCSB in Michigan and it runs great, although I do run PowerService with every tank, and plug it in when it gets down around 5 or less, just so it will start up easier and always let it warm up 10-20 minutes. Even when I havn't had it plugged in it will still start great down to atleast -15...thats the coldest I've had to start it. It's not only the oil that Amsoil has that is outstanding, but their oil filters filter small particles than others which keeps your engine cleaner from dirt or whatever else makes it's way in there. It basically makes an engine perform better for longer.
  • jbull454GMCjbull454GMC Member Posts: 20
    Thanks for the info. My GMC is almost broken in enough I can begin running Amsoil. I currantly use it in my gas vehicles and I must say, I'm very impressed. As a tip for those who have portable generators also: Running a good synthetic oil such as Amsoil will up the loaded running time 20-50% I have found. I let my Duramax warm up 10 to 20 minutes also. It has a factory remote start that lets it run 10 minutes so that makes it easy for me. I am looking forward to running Amsoil in my Duramax just to see how the milage improves too. Thanks again and take care!
  • wvgrumpfishwvgrumpfish Member Posts: 1
    I just bought a 08' LTZ 4X4 Duramax/Allison and I have got 19 mpg on the highway . Yes they have choked the exhaust down and it is not removable except the muffler. My 2001 had just a muffler and I never got below 20mpg's but it was manual shift. If you are interested in my truck it is 4 sale . The judge gave the X the camper so I don't need a diesel now . I have to down size. My e-mail is jccord@comcast.net and I can deliver some what .
    Jim
  • losman54losman54 Member Posts: 22
    I got a new 2007GMC TopKick 4500 pickup body left over this last Dec. customized by Monroe Truck Equipment with all of the works. I drove it it back a 1,0000 and got 15-16 HWY MPG not hooked up to anything. I just put Amsoil new product for 2007 plus Duramax. Let's see if it improves my MPG.
  • riskyrisky Member Posts: 1
    I just got a 2008 gmc duramax 2500 in dec, and just towed my bike trailer with 4 bikes and got 11.3 mpg avg for the trip down and back from MN To FL . When im not pulling anything i get about 16-19 mpg. but it is still cold out and when it warms up im hoping to get a little better because when i was in Florida and not pulling anything I got about 19-20 at about 75 degrees. I have about 6000 mile on it now and i will be switching to Amsoil 5W 40 for my first oil change. I hope to get a 1 mpg better. Wait and see!
  • robhen1robhen1 Member Posts: 1
    I have a 2007.5 at 6000 miles I drove from texas to florida at 75mph I got 20mpg but at 16000 it dropped now at 32000 I'm down to 13.5-14.5 mpg. Is there a fix for this. at this rate of decline I'll have to park it. Chev dealer said there is nothing they can do.
  • madbrit427madbrit427 Member Posts: 11
    I bought my 2500HD Duramax 4x4 in July 2004 brand new. According to the computer, it averages 15.9mpg from the day I bought it, never much varies more than a few decimal points either way. Doesn't seem to care whether I am driving in town, or at 70+mph on the freeways, towing a car hauler or empty, still does about the same economy.
    I live in rural high desert Arizona with longer trips with less traffic than many city dewellers, but with plenty of big hills. Never seen some of these amazing mpg figures that get posted on the internet.
  • losman54losman54 Member Posts: 22
    your right the difference in air mass is going to make a difference. I would try to get a K &N air filter (I don't any stock in the company, but I found it to make a difference). Also I would try to get a "AeroShield Wind Deflector" or a regular air deflector. Keeping it under 65 MPH will help. I just started putting Amsoil 5-40 too in my GMC topkick which has 10,000 on it...right now I'm not seeing any noticeable difference. Good Luck
  • jbull454GMCjbull454GMC Member Posts: 20
    I see we are getting some info on this. Thanks to everyone, Its all very helpful, and mostly dicouraging. The federal government has slapped us in the face once again...It was their idea for the DPF. I'm now doing trying which fuels from which company do better on milage. Walmart, which was the cheapest, got me an average of 15mpg but most of my driving has been start stop. I'm trying BP now. It seems to be doing better with mid 16's on mpg. It also seems to have a bit more power. I've also tried Miejer's standard fuel and biodiesel. Standard was same as Walmart. With Bio it got worse milage, but the milage seemed better than its normal milage after the standard diesel was in the tank again. I know that biodiesel does have better cleaning properties and they say you need to change your filter more often. I think when its time to change the filter I will run a full tank of bio through first. The down fall of my test is that I live in Ohio. We have no fuel testing laws, so we end up with the literal crap from the tanks. So I will see what happens with my research and post it all here. Plus when I switch to Amsoil I'll see what happens. Also another friend of mine runs Lucas fuel treatment. He says he sees improvement in his 04 duramax. Cost effective I don't know yet, but after I find out the best fuel to run I'm going to give it a shot. Thanks again averyone and keep the ideas coming for all of us!
  • kodiak12kodiak12 Member Posts: 1
    Can any one tell me if, since their correction in the 2nd half of 2004, the injector problem that the Duramax had been having has been eliminated or significantly reduced? I"m considering buying a 3500 dually and would like to know how far back I could safely go in model years without an injector problem. Any and all input would be greatly appreciated.
  • jbull454GMCjbull454GMC Member Posts: 20
    I work for a Chevy Dealer. In all of the injector replacements I've seen there have been no more problems, but...I don't think people in this area have put enough miles on them yet either. Although, the Japanese are very particular about things. Isuzu probably informed Bosch to get it right or get lost. I've found out that the Duramax was built to be a million mile engine. So in all actuallity I'd say you were safe in buying as long as the truck isn't abused or anything.
  • madbrit427madbrit427 Member Posts: 11
    As far as I am aware when the LLY engine with the redesigned heads was introduced was when the main injector problem was cured. That being said, my 2004 LLY engine has had 3 injectors replaced at around 50,000 miles. They blamed it on the injector pump as I also had a rough idle and hunting at slow speeds.
    Extended warrantys are good, I extended the factory one and will extend it again next year if the option is still available especially as my truck has only just over 52,000 miles on it.
  • pistolacepistolace Member Posts: 1
    ON YOUR DISPLAY WHERE IT SHOWS AVERAGE MPG PRESS THE CLEAR OR ARROW BUTTON AND IT WILL DISPLAY INSTANT MPG. I JUST LEARNED THIS MYSELF
  • jodie1614jodie1614 Member Posts: 2
    I have a 2003 Chevy Silverado 2500HD Duramax with cooking oil conversion that is throwing a low fuel rail pressure code. I push on the gas and it acts like it is out of gas and wont go over 1500 rpms.
  • madbrit427madbrit427 Member Posts: 11
    Probably clogged up the fuel system using that gunk.
    Monitored this used cooking oil fuel with a bunch of friends who ran bus conversions and many dumped the system because it was so labor intensive. Forget to swqtch over to regular fuel before shutting off the engine for the day just once and you had a bunch of cleaning out before you were on the road unless you were really lucky. Fuel has to be heated to keep it flowing properly, etc, what a pain.
    I could see using used cooking oil if you drove all day and night but for day to day, what a pain it can be.
  • smokinsmokin Member Posts: 1
    I have a 2006 Duramax milage is OK 16-18 mpg. BUT when I reslly get on the pedal the exaust pours out a HUGE cloud of black smoke. I am I running too rich or is this normal??
  • roland3roland3 Member Posts: 431
    ... Are you heating, starting and shutting down on regular Diesel fuel like m.britt says, and also changing filters more frequently. I don't think it would be that much problem for one POV.
  • madbrit427madbrit427 Member Posts: 11
    Take it back to your dealer, you did buy an extended warranty didn't you? Anyway, it should be covered under the 5 year 100K engine warranty.
    I had bad smoke and a really stinky exhaust. After two trips to the dealer, they had replaced 3 injectors, the fuel pump and goodness knows what else and it seems good now (touch wood!!!). But I still don't know what the problem was as they appeared to change parts until the problem was cured. They did say the faulty fuel pump pressure had damaged the injectors.
    Great truck, just love it, but it goes away when the warranty runs out...... LOL.
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