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Thread: LLY Mileage

  1. 12-30-2012, 13:13 #1
    Roy W
    Roy W is offline Enthusiast
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    Default LLY Mileage

    It's been quite a while since I checked the unloaded highway fuel mileage on my '05 LLY (118K), so knowing I was going on a trip over the holidays, I figured this would be a good time. I normally fuel from my auxillary tank, and gallons used in that case is only a guess, so I filled up the truck tank and got on the interstate. I put the cruise control on and held a steady 75 mph (gps). RPM was 2200, engine temp was 180 degrees (45 degrees ambient), boost was a constant 4 psi, and the Edge EZ was set on #1. After 272 miles (gps), I pulled over and filled up and it took 15.5 gallons, which comes out to an average of 17.5 mpg. I thought that was pretty good. How does it compare to others ??
    Last edited by Roy W; 12-30-2012 at 14:13.
    2005 Chevy 2500HD, CC, SB, 4X4, Duramax, ARE Topper, 60 gallon RDS toolbox/tank combo, Kennedy Headlight Booster, Isspro pyrometer and boost gauges, EGR Blocker, PCV Kit, Bilsteins, 265 Michelin MS-2, TTS Exhaust, pulling 35' Jayco travel trailer.
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  2. 12-30-2012, 18:25 #2
    rapidoxidationman
    rapidoxidationman is offline Gone, but not forgotten...
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    http://www.thedieselpageforums.com/t...ead.php?t=9771
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  3. 12-31-2012, 15:37 #3
    AKMark
    AKMark is offline Building another 6.2L powered vehicle
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    Sounds about right
    05 2500HD CC LB LLY, 4x4, 3.73s 235/85R16's, webasto cab heater, to keep it warm.
    03 Buick Rendezvous - When you average over 80 miles per day driving around, you need one of these.
    85 K-5, 6.2, SM465, Rockwell T221, 1 tons, 36's. More goodies to be installed as time and money allows.
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    72 Postal Jeep - Yet another project
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  4. 01-07-2013, 13:36 #4
    Mark Rinker's Avatar
    Mark Rinker
    Mark Rinker is offline Enthusiast
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    Sounds good. I'll be you could do 20+ at 65mph.
    2011 Chevrolet Tahoe 5.3L daily driver
    • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
    • Total GM diesel miles to date : ~950K
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  5. 01-07-2013, 16:56 #5
    Grayfox
    Grayfox is offline Enthusiast
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    Default mileage

    I have an 05 SRW 2500HD crew cab. the sweet spot for my Max is 1800 rpm I have gotten as high as 21.5 and get a consistent 20.5 HWY. This truck is a stock and I have never seen any temps lower then 210 HWY unloaded. Towing Temps as high as 235 towing about 12,500 lbs. avg 11 to 11.5 mph.
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