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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ & LMM engine specific topics.

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Old 03-23-2012, 10:49 AM
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Mark Rinker Mark Rinker is offline
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Default Mileage burning #1 vs. #2 diesel

So...I have been under the impression for some time that the BTU content of these blends are the same. However, on the occasions that I have filled with #1 diesel in warm weather, it seems that my average MPG on the DIC begins to climb.

Yesterday I drove unloaded about 180 miles, filled and realized I put in #1 diesel. On the way home, same speed, I added about 1mpg to my average.

Coincidence? Factual? Maybe a tailwind on the way home, instead of a headwind?
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Old 03-23-2012, 12:16 PM
DennisG01 DennisG01 is online now
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Well, Mark, now you've got me scratching my head! I had always thought that the (very basic) difference was that #1 had slightly less BTU's, but also does not gel as soon. ???
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Old 03-23-2012, 03:20 PM
bshull bshull is offline
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I was under the impression that #1 had less wax in it so it could resist gelling better at lower temps. With the lower amount of wax came lower BTU per gallon.

I am sure someone will chime in and set the record straight.

Brian
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Old 03-23-2012, 04:54 PM
rapidoxidationman rapidoxidationman is online now
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the Mercedes forum, Dodge forum, Cummins forum, and some others say:
less BTU's/gallon (137,000 vs 142,000? ish), less paraffin so won't gel as soon, less lubricity because of less wax, costs more, poorer mileage.

Methinks you had a tailwind...
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Old 03-24-2012, 08:15 AM
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I think it was a tailwind, and a lighter foot on the way home. Average for the 400+ mile day was 19.2mpg unloaded. Not bad!
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2005 GMC Yukon Denali 6.0L gas (hey its paid for)
  • 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
  • Total GM diesel miles to date : ~950K
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Old 03-28-2012, 11:12 AM
tufcj tufcj is offline
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On my 2003, I see a noticeable drop in mileage (2-3 MPG) between November-February when they sell the winter blend diesel here in the Denver area.

Bob
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Old 03-30-2012, 11:27 AM
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Hard to gauge what effect it might have for just one tank of fuel, but #1 has less fuel lubricity and can increase fuel injection system wear when used in warmer weather. Here in Montana, we get winterized fuel (mix of #1 & #2) through about April 1st, and am always glad when the pump indicates straight #2. Jim
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