2018 Navigator 6mpg when towing 8k lb camper

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FMF_Doc_B

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Hello,
First time towing with 18 Navigator L 4x4 with 25k miles. We have a 34' camper that's 8k lb packed (7k on trailer axles, 1k on navi) using a weight distribution hitch. Got it dialed in to where the front is 1/4" higher with camper hooked up vs normal height. Drove from Illinois to Florida and back and averaged 5.8mpg (5.4 in mountains, 6.5 best mpg in flat states). Drove in normal drive mode with auto tow/hual mode, no cruise control, using paddle shift to keep best gear. Drove mostly in 9th gear, 7th or 8th up steepest hills. Drove around 75 mph. Anyone else pull heavy and see this bad mpg? We average 17 mpg around the Chicago suburbs. Wifes 15 Yukon XL towed this trailer on same trip at 9+mpg. Spent $1,300 on fuel this trip!
 

rucus0101

New member
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Did you do a cat scale with the trailer attached? You are probably out of payload on the truck or overloading the rear axle. My navi only has 1437 pounds of payload, 1000 pound trailer, 100 pound WDH, and people in vehicle seems tight unless you guys are real light weights. You navigator is probably around 6200 pounds and you have 8k behind it and people and stuff in it. That's almost 15k rolling down the road like a brick so that mileage is not unexpected. Downsized turbo motors are great for saving gas when you are lightly loaded but once you load them up to continuous workload they are less efficient. The best option if you have to tow that heavy often is a superduty with a diesel. It will probably get around 10-11 with that trailer.
 

FMF_Doc_B

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The best option if you have to tow that heavy often is a superduty with a diesel. It will probably get around 10-11 with that trailer.

I actually have a diesel 2017 Super Duty, but it doesn't fit our big family. Wish I could use it. I get around 11mpg when I do tow with it.

Used Cat Scales, 7k lbs SUV loaded for trip with full tank gas and kids in car, 15k with trailer, hitch, 1/2 tank fresh water in camper.

Will try to do 65mph next time I tow with Navi and see how that affects mpg. Thanks for all the responses everyone!
 

robo21

Junior Member
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With that much weight and that much wind resistance increase I am not surprised. I would try keeping speeds at 55 as the wind resistance drag goes up logarithmically as you increase speed. Plus driving at speeds over 55 MPH towing that kind of weight is extremely dangerous. A blowout or road hazard at those speeds would get ugly very quickly.
 

Ballyhoo

Active member
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Robo21 nailed it. Increased speed + increased resistance, end result more fuel to move one pound one foot ( the physics behind horsepower, energy required to move an object).
 

G-523754

I have a 2021 Lincoln navigator that we just towed with for the first time. With a 12 foot enclosed trailer with a golf card in it. It is a 7 foot tall trailer. Before we left for the vacation we were getting 11 miles per gallon in the city. On the trip we only got 7 miles per gallon towing. We were doing approximately 75 miles an hour from Michigan to Florida. We thought there was something wrong with the vehicle. What are your thoughts
 

2021Navigator

Active member
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I have a 2021 Lincoln navigator that we just towed with for the first time. With a 12 foot enclosed trailer with a golf card in it. It is a 7 foot tall trailer. Before we left for the vacation we were getting 11 miles per gallon in the city. On the trip we only got 7 miles per gallon towing. We were doing approximately 75 miles an hour from Michigan to Florida. We thought there was something wrong with the vehicle. What are your thoughts
Your numbers do not surprise me. Like others have mentioned speed will always degrade your mpg. Also twin turbo V6's generally suffer poorer mpg when towing heavy loads compared to a V8.
 

GHopper

New member
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I have towed significantly with my ‘16 F150 Ecoboost; significant gains (50-75%) in MPG when holding speeds in the low 60’s vs. 75; Towing with my ‘21 Navigator is a similar situation; just have to decide if those few minutes are worth the extra fuel costs.
______________________________
 

ericinseattle

New member
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Hello,
First time towing with 18 Navigator L 4x4 with 25k miles. We have a 34' camper that's 8k lb packed (7k on trailer axles, 1k on navi) using a weight distribution hitch. Got it dialed in to where the front is 1/4" higher with camper hooked up vs normal height. Drove from Illinois to Florida and back and averaged 5.8mpg (5.4 in mountains, 6.5 best mpg in flat states). Drove in normal drive mode with auto tow/hual mode, no cruise control, using paddle shift to keep best gear. Drove mostly in 9th gear, 7th or 8th up steepest hills. Drove around 75 mph. Anyone else pull heavy and see this bad mpg? We average 17 mpg around the Chicago suburbs. Wifes 15 Yukon XL towed this trailer on same trip at 9+mpg. Spent $1,300 on fuel this trip!
Just did Seattle to Phoenix and back 3.2k and got 8.02 MPG with a short navigator and about 7500 weight. Book says 70MPH tops in the book. We did lots of mountain ranges and passes. Guessing difference is the longer vehicle and 5 MPH more.
 
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