I was wondering what you guys are seeing for fuel mileage with the new LBZ. I'm thinking about buying one.
Any problems with them?
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I was wondering what you guys are seeing for fuel mileage with the new LBZ. I'm thinking about buying one.
Any problems with them?
I am lifted with 35's on and I am getting 13.5 to 15.5 around town with some mixed driving, on winter blend. I only have about 4000 miles on this truck. It is getting a little better as time goes on.
My truck is showroom floor stock. I have 1200 miles now. I am seeing 17.5 city, about 20 highway. Haven't gone on a trip yet to get a good look at highway milage. Like others say, it will get a little better once she brakes in.
Just got back from a dirt biking trip. pulling a 6 x 12 enclosed with 4 bikes, gear, tool chest, etc. probably around 3000 pounds. Got an average of 12.2 going 82 mph. This is adjusted for odometer error. Not as good as I had hoped but we were going fast in a lifted pickup. The other truck was an lb7 with the almost identical load, he got just over 13 but he was going around 85 to 86 mph.
My LBZ mpgs are slowly improving. With around 1400 miles on it, I got 17.92 hand calc'ed on a 300+ mile trip into Michigan last Friday running 72-77 mph. No problems whatsoever with mine so far & I like it better than my old LB7.
5000 mile on it now ... average is just 16.6 mpg on winter blend fuel and its a crew cab 4x4 with a cap , 70 % high way driveing and speeds around 80 mph. It seams like its getting about 1 mpg better then my lly. I will say it has no problem running at 80 where the lly seamed to streach a bit to get to 80. The 2006 allison is the best tuned trans since they started using them in 2001!
A friend with a new LBZ came up for a visit from Southern CA couple days ago. He just sent me a note to tell me he got 20 mpg on the return trip cruising at 75. I made the same trip in my LB7 a few weeks ago and got 19.26 on the same route at the same speed. I guess that 6th gear helps.
TC
Yes, he did! Now he's a member here! The 0.74 extra mpg was sure expensive Tsckey!:DQuote:
Originally Posted by Tsckey
Well! We here it from the man himself! Welcome aboard amigo.
TC
i only have 5500 miles on mine. and i have a ladder rack on with ladders hanging in the wind, 3 tool boxes bolted to the sides and a full load of freon and heavy tools and supplys..my last tank got me 17.0 mph..i travel at 75mph when on the highway..Oh yea im happier than a pig in $hit...my ole dually 454 got 6mph..
I only have 350 miles on my LBZ and I am getting 13.6, it is a CC 3500 Duelly so I cant complain. But with all the high numbers I am seeing from the other posters I cant wait to see what kind of mpg I am going to get.
Tony
I have a little over 800 miles and my first tank by computer was 14.9mpg and by calculator it was 15.5, second tank 15.2 by computer and 15.6 by calculator.
I have 4000 miles with a stock CC dually. It gets better every tankful. My '04 seemed to get just a little bit better (identical truck) but this sure cruises better at high speed. Love the 6th gear. By the way, figure the milage by hand, it actually comes out better than the computer. The computer figures it burned 30 - 32 gallons for an approximate milage of 16 but it only will take 28 - 30 for a milage closer to 17 - 18 mpg. The computer figures it burned more than it actually did.
hey guys i got a bone stock lbz (I LOVE IT!!!) im getting about 17
mpg' s city and about 20-21 highway, i just put my goose neck hitch and brake box in it this last weekend ( a b&w turnover ball and a techonisha pilot)
a lot of people say it takes years to get your oney back for the cost of a diesel but in my opioin it is wirth it whenever i need the power to poull a hill with a 4000# tractor on the flat bed, try to do that with a 6.o then tell me how long you think it will take it to be worth it!!
My mileage is starting to go up a little. About 16 mpg on the highway according to the computer, about 17 when I calculate it. I've got about 5,500 miles on it so far, I put a set of 295 BFG AT's on it right after I bought it. I only ran two tanks of fuel before I swapped the tires and can't really see that it made a difference in my mileage.
Crew Cab 4x4 SLT - DMAX - Love it.
1st tank was showing 17.1 as long as i kept her at 70 mph. 75 would drop to 16....
hopefully once broken in, 17 will be norm at 75-80
Well, my truck just hit 1000 miles. I have been getting 14 or so combined averge. However on the interstate at 75 for a full tanK it was only 13.7 mpg. I hope it goes up at the others did when they broke in.
I hope when I get back from this hitch on the rig to hook a 12000 pound load to it and put some miles on it that way.
1st post here. About 2k miles in the first month. Overall average so far is 15.2. Driving is a even mix of rural driving nice and 75-90mph highway. Last tank was 15.6 with a higher percentage of 80-90mph highway. I put 285 tires on and the mileage is with calculated with corrected odometer based on GPS, so fairly accurate.
So far very happy. First GM product in a while, replaces a 2000 f350 PSD which was a great truck also. Getting 1-2mpg better than the PSD and that is with a tight engine still hope to see another 1mpg when I get closer to 10k mileage.
don
I have a 2006 LBZ in a GMC, crew cab, shortbed, 4wd, Allision trans. Bought new in April 2006. I have recored the following mileage:
Tank #1, actual 18.6, DIC says 16.9
Tank #2, actual 19.6, DIC says 17.5
Tank #3, actual 19.8, DIC says 17.6
Tank #4, actual 18.9, DIC says 17.3
Tank #5, actual 18.9, DIC says 17.4
All driving is combination city and highway with AC on, highway speed 65 mph. Truck is 100% stock. Using Stanadyne Performance additive in every tank, 6 oz.
I have asked my Dealer if the DIC is always inaccurate, he says they have found that it varies in every vehicle, some are correct, some are low and some are high on the mileage calculation. I have asked them to contact GM about it. I would think that there must be a calibration adjustment somewhere. If not then the DIC info is of little value in my opinion.
Your comments,
JimO
I have 3400 ish miles on my GMC 2500hd cc allison 4wd.
I have been getting around 15 mpg combined. I havent been using any addatives though. that might help my mpg in the future.
Just traded my 04 2500HD LLY 38000 miles on a new 06 3500 LBZ Dually, drove from Denver to KC to drop off old truck and pick up new. 80 mph the whole way 570 miles.
Outbound trip in LLY 16.9 mpg overall
Return trip in LBZ 11-12 mpg for the first 300 miles, 15.3 mpg in the last 270.
Next day 100 miles of local driving 600 miles on odometer 55-65 mph, 15.9.
LLY 5 speed allison 80 mph, 2400 rpm
LBZ 6 speed allison 80 mph, 2050 rpm
Looking good to beat 04 mpg once fully broken in.
First Post Here, let me say I thought I knew a lot about diesels before i bought one lol, (I drive a 2005 Ford E350 Ambulance w/ a PowerStroke Diesel about 2,000 miles a month). Definately knew that i didn't want to drive a Ford Truck (Never have liked them, their diesels don't impress me much)
- but there's always room to learn a bit more, and these forums are filled with information from Diesel owners.
I'm 21 Years old and work as an EMT for a local ambulance company here in SoCal, and just recently purchased a 2006 Chevy Silverado 2500HD w/ the LBZ Duramax 6.6L Diesel, and i'm quite impressed. I'm dwindling down the last quarter of the first tank (the tank the dealer purchased lol) and the DIC is saying i'm only getting 13.5mpg, but hey, i know that the mpg will get better as it gets 'broken in'. My 01 Sierra got 14mpg and i have much more truck than before.
The 6th gear on the new Allison tranny is wonderful, i can cruise down the freeway at 75-80 no sweat, and the acceleration is terrific for a diesel (at the cost of fuel economy, but w/e).
I purchased the truck because i wanted a larger cab and 4x4 capability, for when i go skiing in the winter (my old 2wd w/ snow chains didn't cut the mustard, even for California mountain driving).
I met many Duramax owners before i purchased one myself, and they all told me how wonderful their experience had been with their GM truck.
Plan to put some larger/wider tires and when the Banks aftermarket kits come out for the LBZ Diesels, i'm thinking about changing the exhaust and some aftermarket guages as well.... After all, 360 HP is 'sufficient' at this point, but who knows, i might want 'more' lol....
reset the mpg calculator, you ll see instant increase while running on highway.Quote:
Originally Posted by Prestonia24
I have 890 Miles so far and am geting 18.8 mpg, better than my 02 Duramax at the same miles, and my 02 at 58000mi was getting 20 to 21 mpg with a best of 22.6 mpg at 65mph so I hope my 06 will do as good or better!!
filled up yesterday after first tank after dealer, 636miles total, tank was topoff, ran 377miles @ 18.17gals=20.7mpg, truck said i used 20.7gals total=18.2.
I run 56 miles, mostly hwy miles to and from work @70mph about 15 city to get out @ 35mph. A lot better them my 04 cc 4x HD 6.0
im thinking of buying the new LBZ and all this info has been great. i was woundering what gear ratio you guys had. i heard it makes a big differance in the mpg. im not looking to do any heavy hauling so the 3.42 would work for me. what do you all have?
thanks
373 is all you can get unless u get the 3500. with the 6speed it is geared final to act like a 342
Yeah, the new 6 speed Allison has a double OD too. Can't immagine going any longer, unless you spent all day cruising unloaded at 100 mph...
We just picked our 06 D/A 3500 4X4 C/C. It had 28 miles on it. I only drove it about 9 miles and dropped it off at an RV dealer to get a B&W gooseneck hitch installed. The fuel mpg computer said it was getting 9.7 mpg average.
I sure hope that the computer isn't accurate. We were getting an honest 15.8 from our 02 "same model truck" just running around town and not babying it. And 10-13.2 mpg towing. I will have to run a tank of fuel thru the 06 and do the math.
Did you reset it before getting the 9.7 mpg reading? If not, it's factoring in the first 28 miles, where it probably never went faster than 15 mph...Quote:
Originally Posted by cowboywildbill
I have less than 700 miles on my Sierra crew LB SLT and I'm getting 14.8 around town according to the computer. I gassed up, reset my fuel meters and was on the highway for about 15 miles and the AVG meter read 16.8. I'm expecting great things form this truck and good milage is just the beginning.
We just traded our 02 in for an 06 D/A C/C 4X4 Dually. At first the computer said we were getting 9.4. But then we topped it off and I drove about 250 miles. I topped off again and did the math. I was getting 15.9, this was in town stop and go. The computer was saying 14.8. I think it is a little under the real milage. I was getting about 15.5 to 16 running around,and driving hard also in our 02 GMC. I think the new one will do a little better once it gets broke in.
Picked up the truck in Joplin, Missouri 404 mile trip home. Accelerated/decelerated probably 200 times during the trip, never on cruise, continuously loading and coasting the engine. Averaged 72 mph, DIC said 16.1mpg, hand calculated 17.65mpg. I couldn't be happier at this point!
I picked up my new LBZ on 7-5-06. It is a GMC CC SB and is bone stock including stock tires. Here is my mileage so far. Some of these fillups are towing a 4,500 lb boat and trailer, some with a 900 lb empty boat trailer and some with no trailer. The 19.5 mpg was with no trailer and 75 mph over 250 miles. The rest is a mixture of highway at 75 mph and 2.5 miles a day to work each way (not helping at all).
Total truck miles MPG
244 18.5 no trailer
478 15.0 4,500 boat
806 15.5 4,500 boat
1,185 19.5 no trailer
1,512 17.5 no trailer
1,783 15.6 no trailer 6,500 boat for 10 miles
2,066 17.8 empty boat trailer
2,306 16.8 empty boat trailer
I have to say the 16.8 was partially due to entering the interstate, with the empty trailer, and a "youngster" in a souped up Honda Accord (you know the one with the big oversized muffler that sounds mean!!!!) attempted to pass me while I was still in the acceleration lane. I just couldn't stand it and when he got up beside me, making a lot of exhaust noise, I punched it and left him with a silly grin on his face. By the time I was at 75 mph I just punched cruise and he never ever came up on me for the rest of my trip until I got off of the highway. This LBZ is a big step up from my '98 6.5. Smiling..............Ed
I just turned 2000 miles and got 18 mpg on the last tank. No highway but some 50mph stretches. I put in Amsoil at 1600 engine and rear. Before that I was in the 16 - 17 range. Don't know if it's the oil or the truck breaking in but I'm not complaining.
I have noticed the DIC is about 1 MPG under too. Getting about 15.8 on the first tank.
Makes me wonder how far off the speedo is to start?
Just got the Diablo and did the 65 HP tune with corrected tire dia of 33 inches. On the freeway it said I was going 40 :confused: when it was really about 65. Then got a brake warning for gosh sakes!!
But I could really feel the diff :D
Going to reset tonite using tire size vs dia and see if it takes and the code goes away.
FB
I just got home after a 500 mile weekend trip. The first half of the trip was all highway at 75 mph, removed a 7000 lb boat from the water and towed it 2 miles to a gas station for fuel, then two miles back to the launch. The rest of the trip was at 70 mph home. averaged 19.0 mpg for the entire trip. Total miles on my 06 LBZ right now is 3,300. Ed
No towing except for the 4 miles with the boat.
Filled up and did a short empty non-towing " semi Highway trip" Some stop and go on a four lane Highway a few lights toward the end. About 135 miles round trip, the computer said we were getting 19.4 at one point. It mostly was saying average of 17.4 while we were at 55 to 65 mph. It seems to be getting better and we only have 1300 miles on it so far.I did an oil and filter change at 1,000 miles Rotella 15w40. I will go with synthetic Rotella after a few more oil changes. I'll post again after I do the math on the last trip. I think maybe about a 16 mpg overall so far best guess.
Just returned from my first 1000 mile trip. 1500 miles on the engine now. Ran the AC the entire way, truck is stock. DIC read 11.2 MPG towing my loaded trailer ~9000lbs. Basically southern CA over the grapevine to monterey and back, AVG speed 55 to 60mph.
The MPG did drop a little when I smacked a cow returning over the grapevine!! :eek: Truck didn't get a scratch but the trailer has some damage. Cow didn't fare too well, but I was the second person to hit him... Shocks bottomed out but I don't "think" anything was damaged we hit hard, I'm going to the dealer this week to double check everything...
I'm starting to think that you need to get 25k+ miles on a Duramax to get consistantly good fuel economy (my '04 LB7 was the same). I was stuck in that 18.5 to 19.2 range for a long time (this is on long Interstate drives), but this past week, I've been getting 20+ mpg with ~26k on my LBZ. Monday I got 20.42 mpg & today I got 20.07, both 300+ mile trips at 70+ mph, hand calculated & using my GPS to track total miles.
Not that I wasn't impressed before, but I'm REALLY starting to like this truck.