289457
Virginia
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Joined: 05/06/2023
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I am currently towing a 28 ft. travel trailer with a 2014 Silverado w/ 6.2 L Gas. Planning to upgrade to a 3/4 ton and comparing a Silverado 2500 to an F250. The Chevy dealer tells me that the new 2500 w/6.6L gas and 10 speed will deliver 20-25% better mileage (from the 9-10 mpg that I get now while towing) than that the current 1/2 ton with 6.2L gas and 6 speed trans. Does anyone have experience with the 2024 GM trucks (2500 or 3500) w/ 6.6L gas? This sounds a little hard to believe?
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nickthehunter
Midwest
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Joined: 07/18/2005
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True - if your willing to travel about 50 mph max.
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KD4UPL
Swoope, VA
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I highly doubt you will see that kind of improvement. My '05 Duramax 5 speed got about 12.5 my 2022 Duramax 10 speed gets about 14.5.
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Grandpop
PA
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Been looking at 24 6.6 L8T gas myself. Most youtube videos say 15-18 empty on interstates, and 8-10 towing. Naturally depends on size / weight you are towing.
Most say it tows much easier than 2020-2023, but gets same or slightly worse mileage towing.
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blt2ski
Kirkland, Wa
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One thing to remember about MPG towing, is front area vs weight is a bigger factor in how good or bad you get. AN increase of 3 sq ft of frontal area, is an equal HP needed when you add 1000 lbs at 60 mph! 15K total lbs, at 90 sq ft of frontal area, needs 135 HP as does a 25K lb rig with 70 sq ft of frontal area at 60 mph. There are some other factors that are weight only, ie how much additional hp one needs climbing hills. That is based on weight. Tire type, tread design, road type can also effect mph as to how much additional hp is needed too.
Reality, it take x number of BTU's to move a given load. Unless you change something ina drastic way, it will take the same BTU's or gallons of gas/diesel to move the rig forward. Granted more gears in the trans can keep the rpm at a lower amount, producing the lower/correct HP to move something, vs over revving using more fuel...... that should help you gain an mpg or two depending on the other factors.
Marty
92 Navistar dump truck, 7.3L 7 sp, 4.33 gears with a Detroit no spin
2014 Chevy 1500 Dual cab 4x4
92 Red-e-haul 12K equipment trailer
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valhalla360
No paticular place.
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1/2 ton trucks have made some nice improvements in mpg running empty but for the most part those improvements don't translate into better towing mpg...it still takes power to tow and the old engines were already operating near peak thermal efficiency when towing. A lot of this comes from running smaller displacement turbo charged engines. This works because your average 1/2 ton almost never uses the full "rated" hp, so you aren't really stressing the engine much. The smaller engine is able to be kept near peak efficiency and has less internal friction losses when running empty.
3/4 ton trucks haven't seen the same improvements as they haven't gone with smaller displacement turbocharged engines. This makes sense as they are more likely to be using the more o the available power and using it regularly. Removing the heat from an engine putting out 300hp is tougher with a small displacement engine.
Tammy & Mike
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midnightsadie
ohio
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#1 never beleave a sales person.they say any thing that might help there pay check.
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Dadoffourgirls
China, MI USA
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Grandpop wrote:Been looking at 24 6.6 L8T gas myself. Most youtube videos say 15-18 empty on interstates, and 8-10 towing. Naturally depends on size / weight you are towing.
Most say it tows much easier than 2020-2023, but gets same or slightly worse mileage towing.
I agree with this. 8-10 with my 32ft travel trailer or 28ft enclosed depending on location. My diesel is about 20% better.
Dad of Four Girls
Wife
Employee of GM, all opinions are my own!
2017 Express Ext 3500 (Code named "BIGGER ED" by daughters)
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JaxDad
Greater Toronto Area
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289457 wrote: This sounds a little hard to believe?
No, it sounds a LOT hard to believe.
It’s basic science, it takes ‘X’ amount of horsepower to move a given load, and it takes ‘Y’ amount of energy (gasoline in this case) to make that ‘X’ amount of horsepower.
To achieve a savings of that magnitude something needs to change, a lot.
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Cptnvideo
Arizona - most of the time
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"The Chevy dealer tells me that the new 2500 w/6.6L gas and 10 speed will deliver 20-25% better mileage (from the 9-10 mpg that I get now while towing) than that the current 1/2 ton with 6.2L gas and 6 speed trans."
You really don't believe anything a car salesman says, do you?
Bill & Linda
Arizona
2019 Dodge Ram Laramie 3500 dually 4x4 diesel
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