miles per gallon - Page 2 - Chevy and GMC Duramax Diesel Forum
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post #11 of 23 (permalink) Old 05-30-2013, 07:29 PM
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Originally Posted by Goose2448 View Post
He's got a LML

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kinda figured he had something newer just had to poke a little fun

-2012 DENALI 1500

-2006 GMC CCSB LBZ --Sold--

-2004 Grand Prix GTP

-2008 Pearl White Streetglide
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post #12 of 23 (permalink) Old 05-30-2013, 07:37 PM
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19-23 on the highway at 65-80 mph, speed dictates. Towing depends on speed and weight, at 75mph and 10k lbs I get 11.5-12.

2007 CCSB LBZ.
EFI live DSP 5 by Rob @ ATP
EGR blocked, PVC reroute
AirDog II 165
TransGo Jr/pump rub mod
Firestone bags
Edge Insite CTS w/ backcam
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post #13 of 23 (permalink) Old 05-30-2013, 08:28 PM
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Before the tires I was getting 19-21 out on the road and around 15-16 in town. Now it's about 18+\-mpg on the road and around 12 to 14 in town depending on my driving mood swings

2012 Chevy LTZ 2500HD
Leveled, 295/65/20 nitto trail grapplers on stock 20's
H&S Mini Maxx running Kory's custom tunes
5" Flo Pro exhaust
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post #14 of 23 (permalink) Old 06-01-2013, 05:56 PM Thread Starter
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Thanks guy i am looking for a 2500hd, and was just trying to see what they get for gpm.
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post #15 of 23 (permalink) Old 06-02-2013, 06:01 AM
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The info here seems to be dead on with the numbers Im getting as well. 2013 crew cab 2500hd 4x4. 18.2 in typical hilly TN "backroads". I havent had a chance yet to put her on the interstate and see what she does, but from the numbers Im seeing, Im expecting 20+ pretty easy.
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post #16 of 23 (permalink) Old 06-02-2013, 06:28 AM
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Highway cruising 75-80 w/cruise I get 18.5-19
In town, probably 13-14
When I am towing my 5th wheel (14,000) cruising 70-75 I have been averaging 10.2-11.4 depending on the number of continental divides I have to cross!

2016 Chevrolet 2500 CC/SB LTZ Z71
745 miles and climbing
B&W Gooseneck w/Companion
2013 Honda CrossTour, 2006 GMC 2500 LBZ (sold), 2003 GMC LB7 CC/LB (sold) , 2012 Keystone Alpine 3600RS
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post #17 of 23 (permalink) Old 06-02-2013, 07:38 AM
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Avg hwy 18, city avg 14, & towing avg 9.

2009 GMC Sierra 2500HD SLE CC/SB 4x4 LMM
EFI Live, Edge Insight CTS, Flo~Pro 4" DP back exhaust w/ muffler & stock trumpet tip, Turbo resonator delete plug, Alum. bleeder screw, WIF sensor delete plug, Fumoto oil drain valve, Pacer LED cab lights, GM dually light bar under tailgate, Footwell lights, Cobra 29 WXNWST CB radio, Wilson 2000 CB antenna, Kenwood speakers, GM chrome oval running boards, Bilstein 5100s, Michelin Defender M/S on PY0 wheels, Rubber mud flaps, Curt class IV hitch
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post #18 of 23 (permalink) Old 06-02-2013, 09:33 AM
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DIC Shows 19
Hand Calculated 18.5

DIC Shows 14
Hand Calculated 15

DIC Shows 16.5
Hand Calculated 16.7

These are all averages. All stock with about 200-300lbs of tools at all times and running 285/70/17.

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EFI LIVE FROMKory Willis and a 5" MBRP straight kit will soon be installed... waiting till warranty is gone!
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post #19 of 23 (permalink) Old 06-02-2013, 02:10 PM
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I never trust the DIC! I have always hand calculated my mileage. My 04 LB7 would routinely get between 11-13 city/western pa backroad driving, and between 19-21 highway driving empty. Between 10-12 city/backroad and 17-19 highway loaded.

Now, my 13 LML blows that out of the water so far! Keep in mind that as of typing this I have only 3200 miles on it, but so far my hand calculations are as follows. Between 13-15 city/backroad and up to 27 on the highway!!!

Just yesterday I had to drive up to Painesville Ohio. Topped off the tank before I left. I have the 36 gallon tank. Took I-79 to I-80 to Ohio 11 to US-6 to Ohio 608 as my route. Round trip of 267 miles, and burned just two butthairs over 1/4 of a tank for the whole trip. I calculated this trip out to 26mpg. This was also factoring in the added 1100lbs of cabinetry I had crammed in the bed.

So, to answer the OP's question... It depends on the persons driving habits, the roads, and speeds. Brand new, I am actually not surprised my LML is getting as good of mileage as it is... I am pretty sure what I am getting now, is about as good as it is going to get. ANYONE tells you they are getting better than 30 highway, or say... 20 city... Call bull$hit!!! LOL

13 EC/SB Silverado LT
Stock, for now...
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post #20 of 23 (permalink) Old 06-03-2013, 01:15 PM
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Absolute best I have ever got is 20.6 MPG. That was empty highway miles at 60 miles an hour. I let the wife drive home that trip and now I have to listen to her tell me I need to slow down so we can get better mileage! Best I (myself, not the wife)have gotten is 19.8 empty, that was driving about 68 with a slight tail wind. I usually get about 16 -17 around home, that is mixed freeway and in town.

Towing a 7500 lb travel trailer, I get 11-12 MPG usually, depend on the hills I have to go over. Have got as low as 9 once with mostly in the hills but I don't slow down much going up hill.


2005 Chevy Silverado 4x4, 285-70-17's on Hummer wheels. Banks Air inlet system w/scoop. Predator programmer, modified mouth piece.

93 Dodge D250, PDR Twins HX35&HT3B, 60+# boost,PDR stage 2 head w/o-rings, PDR Cam, modified VE Pump, piston style lift pump, modified 5" intake w/AFE, ATS ported manifold,DTT 89% converter, 4" RIP exhaust,modified tranny,EGT/boost/tranny/tach gauges.Rear sway bar.Single stage Water/Meth system installed. Oversized intercooler
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