05 chevy 2500 diesel mpg

[crbr]

I have an 03 2500 Dmax with the said to be terrible super duper scary injector popping don`t ever by one LB07. It just turned 88k, ......... Try this site for Dmax info, I have been a member for a couple of years, and the info here cannot be beat. TheDieselPage.com Forums - Powered by vBulletin And here is the link to John Kennedy`s site, he is THEY Duramax guru, and sells the boost stick as well as many other proven Duramax mods http://www.kennedydiesel.com/

I too have been at the Diesel page since 2000, That said, from you reading there (or maybe not) you know it's coming (or maybe not). Just a matter of time and trash. The LB7 was doomed from the get go on many of the less than stellar OEM suppliers for the injectors. Just speaking from my personal experience and the testimony of 100s of others at the Diesel Page. That is a top notch forum for info, as you stated. Thus the injector issue is real.

Best of luck to your LB7 engine. When it dumps while out on the road, it's not a pretty sight. The spillage gets all in the wiring harnesses, all under the truck throughout the entire undercarriage and within days, you'll see the frame turn to a rust coated bare metal. The diesel eats all of the coating off. This machine is a 2001 LB7. I traded it at 58k on the second set. Got a 2002 LB7. Traded it at 98k and it was on it's 4th set. The real pain is not the failure, but finding reliable replacement parts. an experienced Duramax mechanic, GM's willingness to cooperate, and the many weeks / months (literally) of downtime while it's in the shop. Parts are slow and now hard to find. Happy dieseling... I wouldn't have another one if you paid me to take it. I bought an LBZ last year 2007. So far, so good. Mileage is like always in any of them that I have owned... ~15 MPG.

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[R_Walter]

you guys getting 15-17 mpg with your 3/4 tons make me sick i get 16 city(rarely ever drive highway, city is 90% of my driving) in my 2004 1/2 ton silverado Z71. granted i have 285 tires, but i had the computer reflashed for them. just cant seem to do any better then an average of 16. now i've done worse, about 15 a couple times. if i knew i could get a diesel 4x4 extended cab and KNOW it would get 17mpg i'd be doing alright. i could live with that.

Look around for a 96 - 98 Dodge Cummins 12 valve. I got two, 1 auto, 1 5 speed manual; both get at 20 mpg highway. Don't have any towns near me to drive in.

 

[barneyrb]

I don't own one but did make a 900 mile trip driving one last month. Pulling a 18ft 10k bumper pull trailer empty we got 14. With 3 Polaris Ranger XP's (one in bed of truck, two on trailer) we got 8 coming home.

 

[2YD]

FWIW I've had an 05 duramax cc/sb that i bought used at 36k miles 1.5 years ago and I just turned 75k. Averaging 16.5 city and depending on load 18-22 highway. Now mind you I'm sometimes driving like grandma to get up to highway speed (68-70) and I've found that iIt helps to keep it right around the 2k rpm's when on cruise or when accelerating from stops. I also leave the DIC on MPG setting so I can stay aware if I'm hitting the turbo too much. Other factors usually include where I got my fuel, truck warmed up and outside temperature/wind direction. With winter fuels right around the corner I'll take a 20% hit on economy. But all factors considered I'm happy since my former GMC 6.0 was consistently 10-12 mpg. So the duramax is my hybrid.

 

[thatguy]

I wonder if we are comparing apples and apples here?? No one has mentioned what axle ratio they are running.. Someone running a 4.10 is going to get a whole lot less mileage than the 3.5x rears...

My dads '97 Dodge/cummins 3500, AT, 4x2 gets a whole lot better mpg than my 2002 Dodge/cummins 2500, AT, 4x4.. I have a 3.5x rear, but im not sure what the '97 has..

just a thought

Brian

 

[Ryan03]

I wonder if we are comparing apples and apples here?? No one has mentioned what axle ratio they are running.. Someone running a 4.10 is going to get a whole lot less mileage than the 3.5x rears...

My dads '97 Dodge/cummins 3500, AT, 4x2 gets a whole lot better mpg than my 2002 Dodge/cummins 2500, AT, 4x4.. I have a 3.5x rear, but im not sure what the '97 has..

just a thought

Brian

I cannot speak for the latest LMM and the LBZ, but on the LB07, and the LLY we are discussing, the only factory available axle ratio with a Duramax and the Allison in a pickup was a 3:73. I Know that in the LB07 6 speed stick, you could get 4:10s, and I think also in the LLY this was true. With the LBZ and later with the 6 speed Allison auto, a true manual trans was no longer available, as the Allison now had both Automatic and manual operation modes.

 

[Ryan03]

I too have been at the Diesel page since 2000, That said, from you reading there (or maybe not) you know it's coming (or maybe not). Just a matter of time and trash. The LB7 was doomed from the get go on many of the less than stellar OEM suppliers for the injectors. Just speaking from my personal experience and the testimony of 100s of others at the Diesel Page. That is a top notch forum for info, as you stated. Thus the injector issue is real.

Best of luck to your LB7 engine. When it dumps while out on the road, it's not a pretty sight. The spillage gets all in the wiring harnesses, all under the truck throughout the entire undercarriage and within days, you'll see the frame turn to a rust coated bare metal. The diesel eats all of the coating off. This machine is a 2001 LB7. I traded it at 58k on the second set. Got a 2002 LB7. Traded it at 98k and it was on it's 4th set. The real pain is not the failure, but finding reliable replacement parts. an experienced Duramax mechanic, GM's willingness to cooperate, and the many weeks / months (literally) of downtime while it's in the shop. Parts are slow and now hard to find. Happy dieseling... I wouldn't have another one if you paid me to take it. I bought an LBZ last year 2007. So far, so good. Mileage is like always in any of them that I have owned... ~15 MPG.

.

I am sorry to hear of your troubles with your trucks. That being said, I am reflecting on both my personal, and two close friends who have bought LB07`s new experiences. I am well aware of the aftermath of injector failure and the potential for the common rail Bosch injector failure. The 5.9 cummins in dodges from around 02 up used a very similar Bosch injector that required removing the rocker cover to access, and these to are known to fail, and new factory replacement parts are a 50/50 proposition at best. However, in these Cummins, I have used reman injectors from D&W diesel in Cleveland Ohio, with flawless results, and I would expect the same from they`re Duramax reman injectors, which Design wise, are very similar. Breaking down sucks, however often the injectors will give suttle signs before they totaly crap out and fill up the crankcase. The engines will usualy begin to make oil,[Show oil level increases}, get a very slightly rough or chugging idle, a rich idle, or noisier than normal idle. If I would have had your number of injector failures , I to would be unhappy. I attribute my experience to strict fuel filter changes with top quality filters, {whithin my control}, and excellent fuel quality, {Mostly luck}. I wish you the best of luck with your LBZ

 

[john_bud]

I cannot speak for the latest LMM and the LBZ, but on the LB07, and the LLY we are discussing, the only factory available axle ratio with a Duramax and the Allison in a pickup was a 3:73. I Know that in the LB07 6 speed stick, you could get 4:10s, and I think also in the LLY this was true. With the LBZ and later with the 6 speed Allison auto, a true manual trans was no longer available, as the Allison now had both Automatic and manual operation modes.

Gear ratio is easy in a duramax -- 3.73:1. That's the only one that you can get from the factory.

My 03 2500 has 75k miles and has averaged 17.778 since new. Highest mpg has been 22.51 and lowest has been 10.92. It tows 9-10k about 20% of the miles. In the winter you NEED to use the front cover. A hot engine runs better and uses a LOT less fuel.

If you are getting low mpg's, check your disc brakes. In salty areas, the caliper sliders stick and drag. There is so much power, you won't notice it, but can lose 1-4 mpg. The truck runs best below 2000 rpm. At 75 mph you will get about 3-5 mpg less than at 55. At least mine does!

Last, you need to drive like a grey haired granny. You need to start slowly and let the truck shift by lifting the peddle so you get to the highest gear as quick as possible.

 

[Ryan03]

Just completed a trip from Chardon Oh to Salt Fork Oh. yesterday. The truck said 22.1 mpg, which is usualy not dead accurate, but in the ballpark. Normaly hand calculating shows the truck reading 2 to 5 tenthes better than actual. I have not gotten fuel yet, so have not had a chance to hand calculate it. I will fill it up tomorrow and post the results of hand calculation.

 

[Sackett2]

Dad's just doing his 3000/6month oil change this week, so we don't have the enging broke in yet. But on his 2008 Dodge Ram with 6.7 seems to get 16 mph running around, 13-15 pulling the 28' 5'er, and we have seen 19-20 on freeway trips
2wd, midrange rear end