LBZ Fuel Mileage

**Tsckey** · 03-18-2006, 05:51

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

**Mr. D** · 03-18-2006, 10:02

Originally Posted by Tsckey

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!

**Tsckey** · 03-18-2006, 17:41

Well! We here it from the man himself! Welcome aboard amigo.

TC

**spongebob** · 03-28-2006, 19:10

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..

**tonyskidoo** · 03-31-2006, 05:13

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

**Texas Bulldog** · 04-09-2006, 18:56

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.

**BurnsK** · 04-18-2006, 14:41

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.

**cowboywildbill** · 07-26-2006, 04:43

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.

**JohnC** · 07-26-2006, 08:27

Originally Posted by cowboywildbill

It had 28 miles on it. I only drove it about 9 miles ... The fuel mpg computer said it was getting 9.7 mpg average.

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...

**mschuyler** · 04-13-2007, 18:01

16.7mpg hand calculated. DIC said 1mpg less. I love this 34 gal tank!

**Barkbuster** · 08-27-2006, 17:56

Just got my new truck this month and still have not taken a trip in it yet. 800 miles on it so far and never let it drop below 1/2 a tank yet. can`t wait to tow something with it. mileage has been good 17.2 1st fill 1/2 tank. and this tank was just over 1/4 ---17.6 mostly 5o mile round trip to work and showing it off to friends love the power l8r bb

**cowboywildbill** · 08-28-2006, 03:55

Congrats on your new truck. You should be happy with it when you tow, they pull really strong. Those extra two tires on the back of our truck do knock our mpg down 3 to 5 less mpg overall. I'm guessing, but it seems like the 2500 gets 3 to 5 better than the 3500 does, from what I read on the forum.

**Barkbuster** · 09-02-2006, 15:37

After another 220 miles in a week 17.1mpg. 2 days at the dealer for fixing the chirping fan belt (who knows how much idling they did?) and 3days to work with some running around on the weekend. 970 miles on it now and the chirp is back

**Sea-Air-Ahh-LBZ** · 01-14-2007, 20:21

I am new here only one tank of #2 through the 07 GMC Sierra 2500HD ext cab LBZ motor. All fwy. Buena Park up Cajon Pass to Victorville back to Laguna Niguel. 16mpg DIC 17.5mpg caculated at fillup. avg. speed 70-75. I'm like-n-it !

**rhymas** · 03-03-2007, 21:58

I just got mine Wednesday (crew cab, 4x4, 6 1/2 foot bed), my first tank was 13.7 mpg. So far all of my driving has been city. My previous truck was a 2005 extra cab Z71, it was nice, but I really like the diesel so far.

**Kennedy** · 03-06-2007, 13:01

Has anybody tried condition consistent back to back runs in 5th vs 6th gear?

I'm wondering if we won't be surprised. 60 mph is my suggested speed for this test...

**Ramster21** · 07-15-2007, 23:17

Installed my Edge Juice w/Attitude and getting 19 city and 24 hwy.

**DmaxMaverick** · 07-15-2007, 23:24

Originally Posted by Ramster21

Installed my Edge Juice w/Attitude and getting 19 city and 24 hwy.

Calculate it by hand, with a calculator if necessary. Try not to cry, the math don't lie (but your DIC will).

**pimajim** · 07-16-2007, 12:38

My 2500HD/duramax, allison has gotten 20 empty, 10 towing a 35ft 5th wheel, 15 with a 3000lb camper on its back. Rarely changes unless extreme winds.
City or highway.

**David Lunsford** · 09-06-2007, 01:06

Originally Posted by Ramster21

Installed my Edge Juice w/Attitude and getting 19 city and 24 hwy.

What kind of mileage were you getting before the modifications?

Thanks,
David

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