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  1. #1
    Site Sponsor JFF&KRN's Avatar
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    GM 6.6 & 3:73 gas

    Looking for actual input, experience not opinions without experience.
    Anyone that has a GM, 6.6 with 373 gears, towing I would like to know your experience with towing power, fuel mileage and overall performance.
    Again, looking for actual information and maybe a comparison to what you had before. thanks in advance. Jeff
    Jeff & Karen
    Peoria, Arizona

  2. #2
    Seasoned Camper
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    Quote Originally Posted by JFF&KRN View Post
    Looking for actual input, experience not opinions without experience.
    Anyone that has a GM, 6.6 with 373 gears, towing I would like to know your experience with towing power, fuel mileage and overall performance.
    Again, looking for actual information and maybe a comparison to what you had before. thanks in advance. Jeff
    Jeff,
    Gas engine or Duramax diesel? Both 6.6 versions out there.
    Jim & Patricia
    2021 Reflection 337RLS
    2024 GMC 3500HD CC-SRW-SB Duramax

  3. #3
    Site Team Second Chance's Avatar
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    Quote Originally Posted by Dutchman2 View Post
    Jeff,
    Gas engine or Duramax diesel? Both 6.6 versions out there.
    He said "gas" in the title.

    Rob
    U.S. Army Retired
    2012 F350 DRW CC LB Lariat PS 6.7
    2020 Solitude 310GK-R, MORryde IS, disc brakes,
    Sailun LRG tires, solar, DP windows, W/D
    (Previously in a Reflection 337RLS)
    Full time since 08/2015

  4. #4
    Site Sponsor JFF&KRN's Avatar
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    Quote Originally Posted by Dutchman2 View Post
    Jeff,
    Gas engine or Duramax diesel? Both 6.6 versions out there.
    yep gas, i know, but that's what it is.
    Jeff & Karen
    Peoria, Arizona

  5. #5
    Seasoned Camper
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    Quote Originally Posted by Second Chance View Post
    He said "gas" in the title.

    Rob
    Ops - Flat missed it.

    I’m out.


    Sent from my iPhone using Tapatalk
    Jim & Patricia
    2021 Reflection 337RLS
    2024 GMC 3500HD CC-SRW-SB Duramax

  6. #6
    Fireside Member
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    Have a 2020 2500 gas. Gets 8 to 9 mpg towing our 21g toy hauler at about 8500lbs on a good day. 65 to 70 mph doesn’t make a lot of difference. Headwinds kills mileage, 6 to 7 with moderate winds.
    2021 Momentum 21G
    2020 Silverado 2500 6.6 Gas

  7. #7
    Site Sponsor JFF&KRN's Avatar
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    Quote Originally Posted by Tommyp228 View Post
    Have a 2020 2500 gas. Gets 8 to 9 mpg towing our 21g toy hauler at about 8500lbs on a good day. 65 to 70 mph doesn’t make a lot of difference. Headwinds kills mileage, 6 to 7 with moderate winds.
    Thanks Tommyp, how is the performance, as far as hills, etc. and without towing much difference than the 6.0? if yo know?
    Jeff & Karen
    Peoria, Arizona

  8. #8
    Fireside Member
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    Not to many big hills in southern Louisiana, but have towed to Tuscaloosa Alabama with no trouble. Had a 2007 2500 2wd with the 6.0 and 4:10 gears that I towed my 24ft enclosed car trailer with. It weighed about 7500lbs with race car and necessities. Mileage was about the same pulling, maybe a little better with the 6.6. 6.6 has more power and gets better mileage unloaded. Also 2020 is a 4wd.
    2021 Momentum 21G
    2020 Silverado 2500 6.6 Gas

  9. #9
    Fireside Member KDutchover's Avatar
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    Quote Originally Posted by JFF&KRN View Post
    Looking for actual input, experience not opinions without experience.
    Anyone that has a GM, 6.6 with 373 gears, towing I would like to know your experience with towing power, fuel mileage and overall performance.
    Again, looking for actual information and maybe a comparison to what you had before. thanks in advance. Jeff
    We have a 2016 2500HD with the 6.0. We have towed a 230RL and a 280RS for more than 40k miles. 8.0 mpg no lack of power. Some complain of engine noise but gas engines rev and diesels chug. I would not hesitate to purchase the new gas 6.6.l
    Dutch & Marlene
    2016 GMC 2500 HD Denali 6.0L gasser
    2022 Reflection 280RS

  10. #10
    Seasoned Camper
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    That 6.6L should get a 10 speed in the next year or so. That could be a really nice combination for those not needing Diesel and its complexity.
    Matt, Irene, and Ruby (our Golden Retriever)
    2022 Imagine 2600RB with ProPride 3P
    2024 Silverado 2500 LTZ Gasser (3500 payload)

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