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Hey Guys I haven't been on this forum in a while. I just traded a 2015 LML 2500 for a 2020 L5P. 3500 CCLB SRW High Country. I love the truck, power, comfort, and features are all outstanding. I wanted to ask what guys are getting for fuel mileage while towing, specifically 5th wheels or tall trailers.

I've got a 39' toy hauler that's about 16.5k loaded. I took it out for the fist time a couple weeks ago and got about 8 mpg with it. Just seemed a little low to me. It was in northern Ohio ( all flat ) and I had my cruise set at 65 mph. The truck currently has 5k miles on it.

It only seems low compared to my 2015. That truck at the same speed and same trailer got 11.5 to 12. If I sped up to 70 it would drop down to 8 or 9.

Unloaded the truck does way better than the 2015 I average 17-20 mixed driving (all country driving).

Only other thing I'll mention is the exhaust brake it lacking compared to the 2015. Tow haul doesn't seem to want to downshift when slowing the way the old 6 speed did. Other than that the truck pulls great!
 

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Hey Guys I haven't been on this forum in a while. I just traded a 2015 LML 2500 for a 2020 L5P. 3500 CCLB SRW High Country. I love the truck, power, comfort, and features are all outstanding. I wanted to ask what guys are getting for fuel mileage while towing, specifically 5th wheels or tall trailers.

I've got a 39' toy hauler that's about 16.5k loaded. I took it out for the fist time a couple weeks ago and got about 8 mpg with it. Just seemed a little low to me. It was in northern Ohio ( all flat ) and I had my cruise set at 65 mph. The truck currently has 5k miles on it.

It only seems low compared to my 2015. That truck at the same speed and same trailer got 11.5 to 12. If I sped up to 70 it would drop down to 8 or 9.

Unloaded the truck does way better than the 2015 I average 17-20 mixed driving (all country driving).

Only other thing I'll mention is the exhaust brake it lacking compared to the 2015. Tow haul doesn't seem to want to downshift when slowing the way the old 6 speed did. Other than that the truck pulls great!
Congrats on your new 2020!
Be sure to update your signature info with the new truck
(y)
 

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My 38.5' Montana 5th wheel tops out at a little over 16K. I'm getting 10.5 mpg
 
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2020 GMC Denali 3500 CC
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Hey Guys I haven't been on this forum in a while. I just traded a 2015 LML 2500 for a 2020 L5P. 3500 CCLB SRW High Country. I love the truck, power, comfort, and features are all outstanding. I wanted to ask what guys are getting for fuel mileage while towing, specifically 5th wheels or tall trailers.

I've got a 39' toy hauler that's about 16.5k loaded. I took it out for the fist time a couple weeks ago and got about 8 mpg with it. Just seemed a little low to me. It was in northern Ohio ( all flat ) and I had my cruise set at 65 mph. The truck currently has 5k miles on it.

It only seems low compared to my 2015. That truck at the same speed and same trailer got 11.5 to 12. If I sped up to 70 it would drop down to 8 or 9.

Unloaded the truck does way better than the 2015 I average 17-20 mixed driving (all country driving).

Only other thing I'll mention is the exhaust brake it lacking compared to the 2015. Tow haul doesn't seem to want to downshift when slowing the way the old 6 speed did. Other than that the truck pulls great!
l have 2020 GMC Danali 3500 pulling Raptor 356 toyhauler...........16 to 17K. We are in northern Wisconsin and the U P of Michigan so somewhat hilly at times.......getting 8 to 9 mpg at almost any speed........sometime better at the 60mph area. Love the truck!!! Highway mileage at 60 - 65 is 22 - 23mpg.
 

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Remember mileage on a diesel will increase the more miles you have, with that today I did 333 miles straight interstate, 75 mph average And got 20.3 mpg average on the ticker cruise set 90% of the time, about 19.35 calculation

Normally when I tow I have 12-15K on the back and its 11-13 mpg. My loads are not big wind pushers mostly flatbed trailers with weight not campers/enclosed trailers

16,398 miles on the truck. I'm stoked compared to my old ford



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2020 Silverado 3500HD Duramax/Allison, LT, Crew Cab, SRW, Std. Bed, Z71, 4WD,
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First time out towing with the 2020. My 35 ft Montana weighs in at just about 14k. Through the hills of Oregon, and some interstate, averaged 9.9 mpg. My 2007.5 would get 1 mpg better.
 
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