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Old 09-20-2011, 05:57 AM
ktingey ktingey is offline
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Default gas mileage for 2003 2500 HD duramax

I have a 2003 2500HD duramax. I get great gas mileage when I'm not pulling anything, around 22-23 MPG on the freeway. But, when I pull even just a very small empty utility trailer the mileage drops to around 12 MPG. Anyone have any suggestions as to what I should look at to help? Thanks.
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Old 09-20-2011, 06:20 AM
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Edahall Edahall is offline
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What speed are you driving when pulling? Does the utility trailer have a square flat front on it? And how tall does it stick up in the air? The frontal area more than weight is what kills fuel economy.

With the cost of fuel these days, I tow at 55 mph and let everybody zoom around me. I get significant better fuel economy and the chance of a tire blow out is much reduced. There's also much less chance of things getting out of hand at the slower speeds and I get less fatigue so I can drive longer hours.
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Old 09-20-2011, 11:18 AM
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Heartbeat Hauler Heartbeat Hauler is offline
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Quote:
Originally Posted by ktingey View Post
I have a 2003 2500HD duramax. I get great gas mileage when I'm not pulling anything, around 22-23 MPG on the freeway. But, when I pull even just a very small empty utility trailer the mileage drops to around 12 MPG. Anyone have any suggestions as to what I should look at to help? Thanks.
Mine won't even run on gas!!!!


Are you running in Tow/Haul mode when towing? Either way it shouldn't drop 10 mpg, and a Duramax probably wouldn't even notice a small utility trailer. 12mpg is about right when I towed my 5ver, but it was 10,000lbs. I've never gotten above 20.2 mpg empty on the hi-way at 55mph and that was only once. Usually get around 17.5 -18mpg.

OnEdit: Have you serviced the transmission and the rear diff?
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Old 09-22-2011, 05:47 AM
ktingey ktingey is offline
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Thanks you two. Good info. I am ususlly going 70 Miles an hour. The trailier is only around 700 pounds. It does have sides on it and the frontal area is 8 feet wide and sticks up 2 feet. I did have the transmission and rear end fluids serviced last spring. I usually don't put it in towing mode unless the load is really heavy.
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Old 09-23-2011, 01:57 PM
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JohnC JohnC is offline
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Are you calculating the mileage or relying on the DIC? It could be off, especially if you have any type of power tuner installed.
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Old 09-24-2011, 06:08 PM
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Heartbeat Hauler Heartbeat Hauler is offline
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I would try the tow/haul mode once and see if it makes any difference, it make 10 mpg difference, but I would try it.
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2001 Silverado 3500 Dually LS Ext Cab, 6.6L Diesel, Banks Stinger Kit, 4" Exhaust, VR Straps, Bilstein shocks, 255/85/16 BFG KM2s
2004 Suburban 2500 LT 6.0L 4x4, Bilstein Shocks, Federico front/rear sway bars
1996 Caprice 5.7L LT1, B4U Suspension, KYB shocks & Hotchkis sway bars, BMR RCA
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