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Old 05-13-2019, 08:20 PM   #1
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Am i doing something wrong?

Not looking to start a "should get a Ford, Dodge, Toyota......
But--Not sure if it is normal or not, but I pull my V nose TT weighing about 7000 with a 2015 Chevy 2500 HD with the 6.0L gas engine and 4:10 rear end.
I cant seen to get over 7.5 mpg no matter what I try. I have tried all ranges of speed from 55 to 70, tow mode and no tow mode, no cruise and cruise. I still hover on the 7.5 mpg.
I had to upgrade from my 2005 GMC sierra 1/2 ton because its max tow was just 7200 but I got 8 mpg with the 5.3 towing at max capacity.
My camping neighbor this weekend was pulling a 6000 pound Passport with a 2016 GMC 1/2 ton and he gets 10 mpg.
I am seriously thinking about downsizing my truck to a 1/2 ton. I don't intend to get a bigger camper, but I do love the guts this 3/4 ton has on big hills in the Ozarks and knowing I don't get blown around on the road by the big rigs. But I know a 1/2 ton can handle my camper...so thats my dilemma...
Am I missing something?
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Old 05-13-2019, 08:29 PM   #2
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My 2016 Silverado 3/4 ton, 6.0L, 6 speed, gets about 9.5 - 10.5 with my Mini Lite 2503S, about 5,000 lbs.
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Old 05-13-2019, 08:30 PM   #3
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Quote:
Originally Posted by pd2436 View Post
Not looking to start a "should get a Ford, Dodge, Toyota......
But--Not sure if it is normal or not, but I pull my V nose TT weighing about 7000 with a 2015 Chevy 2500 HD with the 6.0L gas engine and 4:10 rear end.
I cant seen to get over 7.5 mpg no matter what I try. I have tried all ranges of speed from 55 to 70, tow mode and no tow mode, no cruise and cruise. I still hover on the 7.5 mpg.
I had to upgrade from my 2005 GMC sierra 1/2 ton because its max tow was just 7200 but I got 8 mpg with the 5.3 towing at max capacity.
My camping neighbor this weekend was pulling a 6000 pound Passport with a 2016 GMC 1/2 ton and he gets 10 mpg.
I am seriously thinking about downsizing my truck to a 1/2 ton. I don't intend to get a bigger camper, but I do love the guts this 3/4 ton has on big hills in the Ozarks and knowing I don't get blown around on the road by the big rigs. But I know a 1/2 ton can handle my camper...so thats my dilemma...
Am I missing something?
Try an exercise. How many miles do you tow per year?
2000 Miles?
That will take 200 gallons at 10 MPG and 266 gallons at 7.4 mpg.
So, you'd be looking at 66 gallons per year, or at $2.50 a gallon...
upwards of $166 a year. Your call.
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Old 05-13-2019, 08:33 PM   #4
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Am i doing something wrong?

I have an opinion. You donít have to answer to anyone, but yourself.

Is your old truck paid for?
You already said you were happy with it.
Does the ~~15k or so difference affect you in any way?
Is the only/main reason fuel mileage your reason to trade?
Unless you tow a bunch...it will take forever to make-up the additional costs to save 20-25%....possibly.
Just a couple thoughts. Some people want warranty and improved reliability. Ymmv
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Old 05-13-2019, 08:40 PM   #5
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Your camper could probably be towed with a 1/2 truck all day long. I think you are missing the bigger pictures. Who cares about 2-3 miles a gallon while towing. I miss my 1/2 ton as a daily driver because I was getting 18 mpg now I get 11-12 driving daily and drive a truck that rides like a lumber wagon. That's the price of owning an 11k rv that requires and hd truck. Bottom line is you could never make up the loss of sale and buying a new truck just to save a little gas. Should of never got an HD truck in the first place to tow a 7k camper.
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Old 05-13-2019, 09:16 PM   #6
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A lot of towing has to do with wind. My Duramax 3/4 ton will get 11.5 to 10.6 towing in a windy day. Very little wind 12.5 to 13.5 . Usually tow at 63 mph. That seems to be the sweet spot. The camper dry weight is 9,000 lbs.
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Old 05-13-2019, 09:25 PM   #7
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I don't think 7.5MPG is totally out of line for that weight of trailer. My father has a very similar truck, a 2016 2500HD 6.0 4.10 rear end, towing a Puma 25RS that weighs 4900 dry, so ~6000 going down the road. He hasn't gotten better than 9MPG, usually 8.5 or so. With your heavier trailer, that actually sounds about right.

I have a 2018 Silverado 1500, with the 5.3 engine and 3.42 rear end, towing a 4100 pound dry Mini Lite, and I get around 10MPG, but have gotten as low as 9MPG before when driving at 70MPH for a couple hours. (Note, that is the one and only time I've ever towed at 70MPH, I didn't enjoy the experience at all!) I think that with a 7000 pound trailer in tow, you're not going to get any better than 8-8.5MPG. To me, that isn't enough of an improvement to warrant purchasing a new truck, but it may be for you.

I will also add that I have convoyed with my father a couple of times, and he is able to pull hills with his heavier trailer better than I can, and, on paper, our engines are very similar. That 4.10 rear end and 6.0 makes a great towing combo. There are several hills where he is able to stay in 5th or 6th gear comfortably, and I'm in 4th gear, or even 3rd, to pull the same hill. I don't think you will be happy with the 1500 towing that much weight long-term, and I think the mileage difference is going to be relatively small.

One final note that if you drive a lot solo, the 1500 will do much better on fuel than the 2500. I get 23-24MPG highway with my truck, and my dad's truck has never broken 16, even at 60MPH.
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Old 05-13-2019, 09:25 PM   #8
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It's those 4:10 gears. I had them in old Suburban 3/4 ton. Got like 6-7 towing a 3000 lb trailer. Thing towed like no other. 350CI and I could run the rockies like there was nothing attached.
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Old 05-13-2019, 09:29 PM   #9
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A lot of towing has to do with wind. My Duramax 3/4 ton will get 11.5 to 10.6 towing in a windy day. Very little wind 12.5 to 13.5 . Usually tow at 63 mph. That seems to be the sweet spot. The camper dry weight is 9,000 lbs.
2014 GMC Duramax 3/4. My top has been 16mpg...conditions were about perfect. Pulling just under 10k loaded. Average is around 13-14.
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Old 05-13-2019, 10:25 PM   #10
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You have several things going against you, 1st the 6.0 motor is not a fuel efficient motor, its a good steady powerhouse to pull, but not really designed for efficiency, 2nd with the 4.10 gears your truck is designed for pulling and loads, that hurts fuel mpg. 3rd - the 2500HD weights over between 1000lbs and 2000lbs more than a 1/2 ton, more weight equals less mpg. I just spent several months shopping for a 3/4 ton gas truck, none of them get good mpg compared to 1/2 ton, but when I'm hooked to my camper I'm sure glad I have the stable feeling of the heavy truck when I'm on the open road.

Good luck with your travels and decisions, I'd stay with the HD if it was my decision
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Old 05-14-2019, 12:44 PM   #11
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I own a GMC Sierra 4WD 1500 (1/2 ton) extended cab which has a 5.3 liter engine and 3.42 rear axle ratio. I tow my 7200LB, 30ft TT with my half ton in tow haul mode.

Highway driving I average 10MPG - City Driving I average 8MPG

Must ask if the 7.5MPG you are getting is city driving or highway driving or the combination of both?
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Old 05-14-2019, 12:50 PM   #12
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As stated, so much depends on travel conditions, traffic, wind , terrain etc. We have done two big trips (10000 miles or longer) which is when you get a sense of what your real mpg is. Almost unbelievable, but we did a big trip to the north coast of Alaska in 2015 and a North America ď circleĒ trip in 2018 and averaged 11.3mpg on both trips! So thatís now my stated mpg. Towing 9000lbs with a F150 6.2L gas, 6 spd transmission. Rarely ever tow above 63 mph or so.
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Old 05-14-2019, 01:01 PM   #13
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You're getting what they get for mileage 7.5-8 mpg. Notice, my rig is just about the same as yours, I have a full cap on the TV. I run about 62 mph in tow/haul, no cruise usually
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Old 05-14-2019, 01:03 PM   #14
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I don't think anything with 4:10s gets good mileage. Maybe a gear swap?
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Old 05-14-2019, 01:21 PM   #15
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It's those 4:10 gears. I had them in old Suburban 3/4 ton. Got like 6-7 towing a 3000 lb trailer. Thing towed like no other. 350CI and I could run the rockies like there was nothing attached.

X2 I agree that is part of it. When I had my 2002 Chev. 1500HD w/6.0 gas, 3:73 gears I only got between 7.5 & 9 max. towing a 34' 9500 lb TT. Back then, pre-6, 8 & 10 speed trannys , I had to lock out OD (4th) and just let it use 3 speeds plus locking torque converter. If I let it use OD, it would upshift, the torque converter would lock & immediately unlock & downshift to 3rd anyway.Made for a real herky jerky ride! And forget cruise control! I found it drove smoother if I had control of the throttle. I could anticipate the little hills & give her a little gas sooner & she wouldn't downshift so often.
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Old 05-14-2019, 01:30 PM   #16
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Our 2018 6.0 6 speed with 4:10s gets got between 8- 9 mpg pulling the hills in SoCal and AZ. We have gotten 15 on the freeway. Our trailer is 8818 GVWR + 50 lbs for hitch + 200 bed load + 600 for in truck passengers, gear and tools
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Old 05-14-2019, 01:32 PM   #17
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And forget cruise control! I found it drove smoother if I had control of the throttle. I could anticipate the little hills & give her a little gas sooner & she wouldn't downshift so often. [/QUOTE]


What you didn't like that jump to 5500 RPM? Never realized how much throttle cruise gave it until I tried to duplicate it. Pretty much WOT.
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Old 05-14-2019, 01:42 PM   #18
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And forget cruise control! I found it drove smoother if I had control of the throttle. I could anticipate the little hills & give her a little gas sooner & she wouldn't downshift so often.

What you didn't like that jump to 5500 RPM? Never realized how much throttle cruise gave it until I tried to duplicate it. Pretty much WOT.[/QUOTE]

DW didn't like her head being snapped out of snooze mode! Had to make happy wife so I could have happy drive.....
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Old 05-14-2019, 01:45 PM   #19
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From my observations on the forum reported MPG's are like fish stories most of which are embellished at best take them as a baseline.

Personally I can get between 9MPG and 13 MPG on average based on terrain, traffic, weather...etc.. with my setup a 2015 RAM 2500 diesel that weighs close to my TT at 8K and that's hand calculating it not using the trucks trip computer that always tells me I am getting more.
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Old 05-14-2019, 02:01 PM   #20
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I agree with TheWolfPaq82, that 4:10 gear ratio reduces your speed, drives up the engine rpm and gives you one pulling machine. Most of the comments getting mileage in the 12 to 14 mpg are probably runing a 3:73 ratio and have diesel engines. I tow a 5th wheel with a dry weight of 8084 lbs. and loaded 9600 lbs. with a Chevrolet 2500HD diesel with 3:73 gear ratio, at 63 mph with cruise on, I average around 13 mpg.
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