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Old 06-23-2022, 03:27 PM   #1
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Fuel consumption


This is my first post so appologize if its in the wrong spot or has been discussed. I did a quick search but couldn't find it.

I have a 2022 toyota tundra sr5 that I will be using to tow our travel trailer. We are looking at a few different models ranging from 3000 lbs to 5600lbs.

My question is, with a truck that size (it has a roughly 11000 lbs towing capacity) would there be a substantial difference in the fuel consumption of the truck between a 4000lb trailer and a 5500 lb trailer?

The 5600lb model is used and a nicer model than any of the new, lighter models we are looking at foe the same price, however I am concerned the additional 1600lbs or more would use significantly more fuel to tow.

Any help is appreciated.

Thank you
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Old 06-23-2022, 03:33 PM   #2
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No, there will not be a significant change in mileage due to weight.

Your big change will come due to the fact that an RV is a giant sail.

My Duramax dually gets as good of milage pulling my car trailer with 6 tons of pellets on a 3000 lb trailer (9000lbs total) than I got pulling a friends single axle 19' trailer with a gross weight of 3500lbs.
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Old 06-23-2022, 03:37 PM   #3
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Yes, and also if one has a larger frontal area, it will also reduce your mileage. Pulling the weight is one thing, but you also have to pull it through the air and trailers in general are not designed for great aerodynamics. When looking at trailers make sure your tow vehicle can move both its weight and it's frontal area. Both figures should be in the manual and are often online. In general a heavier trailer will use more fuel, so will a taller or wider one.
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Old 06-23-2022, 05:11 PM   #4
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Awesome. Thanks for the input. Both responses were very helpful.
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Old 06-23-2022, 10:20 PM   #5
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I doubt the weight difference will equate to 1mpg difference between the trailers.
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Old 06-24-2022, 07:43 AM   #6
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Welcome to the forum. Frontal area of both trailers will be about the same. It always takes more energy to pull more weight so fuel consumption of the heavier trailer will be more. The V6 turbo in your truck is new and it would be hard to say quantitatively how it responds to towing pressures and fuel economy. The Ford Ecoboost V6s get great fuel economy empty, but poor economy towing. I believe your truck might perform the same and weight would be a factor.

Your driving style (heavy foot) and where you live (hills and mountains, wind) will greatly affect your fuel economy.
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Old 06-24-2022, 11:03 AM   #7
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I just towed my 28 Ft enclosed car trailer on my 06 Ram 3500 mega cab 5.9 diesel. Empty on the road I get 23 to 25 MPG at 70 MPH. With my 4300 lb empty car trailer I get 10 to 11 MPG at 70 MPH. I put a 4700 lb Plymouth Sport fury in it. I got the same 10 to 11 MPG at 70 MPH. It is the big box that you are towing.
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Old 06-24-2022, 11:19 AM   #8
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Agreed. Almost no difference on flat ground, as AERODYNAMIC DRAG is by far the largest factor affecting MPG.

On grades is the only place that weight makes much difference in MPG.
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Old 06-25-2022, 06:03 AM   #9
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Great thanks for all the input. Super helpful!

I really appreciate all the responses.
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Old 06-25-2022, 07:19 AM   #10
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not sure about mileage with the new Tundra but folks I know that have had a Tundra could tow just about anything but never got good gas mileage. they werent known for much cargo capacity but were very capable trucks.
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Old 07-28-2022, 02:52 PM   #11
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Update for anyone interested

I ended up purchasing the 5600 lb model trailer (cougar half ton 22rbs) and towed it this past weekend for the first time. I usually average 14.6 L/100km when driving around (which is a mix of city and highway) while towing I was averaging 22-23L/100km, bit basically all highway driving. I was expecting it to be double my average so the fact that it wasn't was a nice surprise. Well see when I tow on some more city roads how it effects the mileage.
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