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Old 04-01-2024, 05:43 PM   #1
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Fuel mileage

Thinking about switching to a new chevy 3/4 ton diesel. I’m just wondering about fuel mileage pulling and not pulling.
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Old 04-02-2024, 10:28 AM   #2
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My 02 CC, LB, dually got 10-11 towing a 16,000# 5er, and 18 empty.
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Old 04-02-2024, 08:57 PM   #3
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2019 CC SB 8.5-10.5 pulling 14,000lb fiver, 20mpg not towing.
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Old 04-03-2024, 08:35 AM   #4
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Thanks for reply
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Old 04-03-2024, 11:21 PM   #5
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About 10-11 towing 13k at 65.
About 16 not towing at 80.
2018 GMC 2500 Hd Duramax.
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Old 04-26-2024, 01:58 PM   #6
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Duramax mileage

My 2015 GMC Sierra 3500HD Duramax achieved an average highway mileage of 22 mpg unladen. However, now the 8' bed is loaded with gear, is covered with a cap, and the platform rack on the cap roof is also loaded with gear. I now average only 16-18 mpg highway miles. When my fully laden truck tows my 10,000-lb trailer, I've been averaging 10.5 mpg over thousands of miles.
Hope that info helps!
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Old 04-27-2024, 10:57 AM   #7
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Old 06-01-2024, 06:48 PM   #8
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Real question to answer should be what's the cost per mile?

That's what we were asked by our son the heavy equipment diesel mechanic. (40 years of advanced training & experience)
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Old 01-11-2025, 12:49 AM   #9
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mpg

I have a 2018 with 35,000 miles on it now
It gets over 20 mpg up to 26 was the best on the hwy
But when towing a 20' mini lite it gets 12 if I slow down to 55 mph
I think it's mostly the wind resistance as the trailer is only 4100lbs
I put a wing on the back of the camper shell but it didn't help because it was to far in front of the trailer I believe
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Old 01-28-2025, 09:28 AM   #10
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2022 GMC 3500 SRW Duramax pulling a 35' Alliance Paradigm 310RL, TGVW 15,000.
worst tank so far, 8.8 MPG, best tank so far, 10.1 MPG, average tank is low 9
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