What kind of milage are you guys getting ?

I think I've only seen like 1 person on here so far with a 2006. Time will tell.

Keep an eye here:

http://personal.linkline.com/rlockyer/2500Gas.xls

Note that I just installed 285's Friday and filled her up today (a lot of idling on this tank), so I added a column for corrected mpg (multiply mpg by 7.8%). The correct formula will kick in on the next tank.

Here is my original that I created for my '03 Tundra:
http://personal.linkline.com/rlockyer/TundraGas.xls

16.7 hand calculated mostly freeway at 80 mph, 750 miles on truck.

16.7 hand calculated mostly freeway at 80 mph, 750 miles on truck.


I know it's early to start evaluating the numbers, but I was expecting a bigger difference - doesn't look like much of an improvement over the LLY MPG's

the early 06s are LLYs. 06.5 will be LBZ.

the early 06s are LLYs. 06.5 will be LBZ.
LLY's with a 6-speed Allison.
I'm running about 1800rpm at 70.

15.8 hand calculated for the first tank, mostly 5-6 mile runs on the highway, and some in-town. Anyone else notice their '06 runs considerably better than the '05's? Same engine, totally different beast IMO. BTW-less than 400 miles on pickup.

My first tank, dealer filled got me 16.8. half & half freeway city. never over 75mph
6 speed alli.
The computer tells me I am getting 20 with cc set @60mph and 18 set @70mph flat ground no towing 400 miles on odo.

I have 3000 miles and at 56 I get 20 and as the speed goes so does mpg. Sunday with 5 in truck and 4 wheeler in back at 70-80 got 18.3 to 19 mpg. Went 430 miles on 23.55 and that tank went 20 miles and took 1 hr and 15 mins. in stop and go so I am happy camper. Last Wed went to race track and ran 16.006 best in 4 runs and that tank I got 17.3 or so.

I have 3000 miles and at 56 I get 20 and as the speed goes so does mpg. Sunday with 5 in truck and 4 wheeler in back at 70-80 got 18.3 to 19 mpg. Went 430 miles on 23.55 and that tank went 20 miles and took 1 hr and 15 mins. in stop and go so I am happy camper. Last Wed went to race track and ran 16.006 best in 4 runs and that tank I got 17.3 or so.

RRRIiiiiggghht. Your DIC is lying.

On a recent 2353 mile trip averaged 20.2 mpg keeping the speed between 60 - 70. That's around 400 miles for half tank of fuel.
06 3500 SRW

My dic is showing 1 mpg less than the gal/miles

That is dic 17.3 and 23.5 divided into 430 miles.

18.25 mpg the gods truth now that is cruze control driving
99 PER CENT OF THE TIME

326 miles, 17.4 hours and 12.3mpg. This is local and in town driving plus a few quick 0 to 50 times. About 1/2 the miles are in 50mph speed zones the rest at 30mph or less. The longest run between stop signs is 2 miles. I haven't towed anything yet and won't until January then I will see how it does with a gross weight of 34,000lbs. My 1998 K3500 with a 454 got about 8mpg driving the same route and about 6mpg grossing 34,000lbs.

Hey guys! I'm new to this site. Just bought an '06 lly. I just arrived in N.C. from M.D. on a trip and was getting between 28 and 30 mpg!!! Granted I was following my dad down (and he refuses to go over 55 mph). Truck has 2,000 miles on it.

just bought an 06 lly. still breakin it in, 18.55 mpg

my stock 06 LLY standard cab 2WD gets 17.5 running 75 MPH 70% time and around town the rest. Hand calculated. I have a utility cap on the bed with tools, sheetmetal brake, ect total of 1500-2000 LBS at all times.

I'm on the third tank and hand calculated 18.2. Mostly freeway, mountains above 4000 ft @ 75 mph.

Drove 230 miles to Bakersfield. Topped off before we hit the freeway and again shortly after arrival. 16.2 hand calculated. I had cruise set at 80 mph most of the way.

I have 4,000 miles on my early 06 LLY. I am averaging 19.6 ,empty, running 60ish. Waiting for GN Dump trailer to be built,will let all know mpg when I start to haul.

Uh, I find that incredible. Did you have a rope tied to his rear bumper? ):h Were you going by the DIC?

Hey guys! I'm new to this site. Just bought an '06 lly. I just arrived in N.C. from M.D. on a trip and was getting between 28 and 30 mpg!!! Granted I was following my dad down (and he refuses to go over 55 mph). Truck has 2,000 miles on it.

With 7500 miles on it now towing a 33' 2 slide TT I get between 8.7mpg and 9.8mpg freeway at 70-75mph. Around 17-18mpg empty.

I'm doing what Rich is doing...click the link in my sig. and you can watch me as I bring on the miles. I try to update it at least once a week.

Or here is the link if you are too lazy http://members.cox.net/rustyyoung/mileage/06DuramaxMileage.htm

Uh, I find that incredible. Did you have a rope tied to his rear bumper? ):h Were you going by the DIC?
On a steady cruise over level terrain at 55 drafting another vehicle, I would not be surprised to see numbers in the mid 20s, either from the DIC or hand calculated (FWIW, my DIC has always estimated low, even before I changed tire size).

Remember, with the 6 speed, at 70 we're only turning 1800. At 55, we're probably down around 1400 and JUST barely into 6th gear. Ya, I can granny mine into 6th at 45, but she pops out as soon as I relax and give it ANY throttle over a tickle.

if i stay under 80 on the the highway, i get 17, thats with the cat deleted with an aftermarket muffler... 5200 miles on truck

just under 3000 miles getting 19mpg mostly hwy 06 LLY

thats doing 65

and thats figuring it out on paper not the dic which shows 16.5-17 and empty of course

:funnypost I think the noob is trying to up his post count.

I got 1,500 miles on my 06 and my DIC tells me that I am only getting 12.5 around town. Let me know when I can get sick

Stop and go traffic and poorly timed signals absolutely kill my mileage.