Gas Mileage Experiment - Data

Griffin99

Tremor Buff
Joined
Apr 8, 2021
Messages
68
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Location
Wisconsin
Military
Army
Current Ride
2021 F-350 Lariat Tremor
I am on my way in the morning to make a long trip from where I live in West Bend, Wisconsin to Grandfield, Oklahoma. It is the annual hunting pilgrimage.

In September, I replaced my stock fuel tank with an S&B 60 gallon tank. I just fueled up about 30 minutes ago at a station approximately 1.5 miles from my house. Early tomorrow morning, I will pack up my pre-staged gear into the bed of the truck, put the tonneau cover down, then head out on the road. We'll see what will happen with no stops for fuel until I hit empty. My theory is that I can drive, without needing fuel from West Bend and not fuel up until I hit Grandfield. No towing and approximately 300lbs in the back, with us four grown men in the cab. To be clear....physically grown...but 12 years old mentally.

I thought I would post a couple of pictures of the gas pump and fuel tank, then do the math when I get to Grandfield and see what the numbers say. Just interesting for data on the 6.7L. For specs, I have a 2021 F350 Tremor with Nitto Ridge Grapplers, and an S&B cold air intake.

The pump cuts you off at $100.00, so I had to finish on two purchases. I just showed the line of where I filled up to as I will do the same when I hit Grandfield tomorrow night. So I put about 38.6 gallons in. We'll see what the math says tomorrow evening. More to follow!
 

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Ok, so we made it to the cabin without any issues at all. So here are the final pictures. The first three at the pump are all from the same transaction. The picture for 2 gallons was one side of the pump moving at the pace of old people fornicating, so my buddy asked me to try the other side. So the second picture is when I hit the limit of $100.00 at the pump and the third picture tops off the tank. Then, there is a picture of the nozzle where i have filled the gas to right at the same level as the fill up in West Bend.

The last picture is the mileage gage and trip data. According to the data, the total trip was 1036 miles for an average of 20.2 MPG for the trip that took 16 plus hours. When we hit Grandfield and filled up, we still had 200 plus estimated miles left on the tank.

So, the final number is 1036 miles ÷ 52.1 gallons of fill up = 19.88 actual MPG. The gage on the truck read 20.2. So rounding the actual MPG to 19.9 and subtracting 20.2 give me a variance of 0.3 MPG.

I will just add what I did here and this is not intended to be anything other than what has worked for me. I started day 1 using AMSOIL 4 in 1 diesel addative. I have used it in every tank, no exceptions. I have changed to AMSOIL oil at 1250 miles. At 7500, I changed to AMSOIL Transmission fluid, transfer case fluid, and front and rear differential fluid. I am even running AMSOIL DOT 4 brake fluid. Combined with the S&B 60 gallon tank and the s&b cold air intake, I am thrilled that using a quality product I can produce these results....I could not be happier!!!
 

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Damn I need to order that S&B tank. Not having to fill up multiple times on one of my regular trips would be so helpful.
 
(y)(y) Big thumbs up (y)(y) on converting everything over to Amsoil products. Its good to see people actually exchanging their Brake Fluid.
I envy your fuel capacity. Coming from long beds with 48 gallon tanks, the Tremor definitely requires it's share of stops .. which are now referred to as pee breaks. Which are now a result of having the Console Refrigerator .. 😂 😂 ..!!
 
Towed our 27’ toy hauler yesterday for a round trip of 200 miles and used 3/4 tank in my 2022 6.7. This is in Colorado in the mountains. The dash said 10mpg. Empty I’m getting about 19.7. Trailer weighs about 8000lb and is a huge wind sail. I’ll be swapping tanks as well. Did you change the DTE with forscan or use their tool?
 
Towed our 27’ toy hauler yesterday for a round trip of 200 miles and used 3/4 tank in my 2022 6.7. This is in Colorado in the mountains. The dash said 10mpg. Empty I’m getting about 19.7. Trailer weighs about 8000lb and is a huge wind sail. I’ll be swapping tanks as well. Did you change the DTE with forscan or use their tool?
Great information. What do you think was your average speed? Also I have a 6.7, it has 11k miles. At 65 mph, I average 20.5 MPG, at 70 mph I average 19.3 MPG. I use no fuel additives, all recommended Motorcraft fluids. Not sure what all this means other than I am close to the same results without the added expense of non stock fluids. I am a big believer the 8K added expense for the 6.7 will pay for itself over a few years in fuel cost savings, not to mention exponentially more torque. I can leave a diesel at idle with AC on in a hot climate with no worry of overheating, I could go on but no need. With respect, every one has a choice based on their needs and financial means. My 2017 6.7 had 106K when I traded for my Tremor. No expense or warranty claim throughout ownership, other than recommended maintenance. No modifications whatsoever and only Motorcraft fluids. I respectfully am only sharing my prior and current 6.7 ownership experience. We all love out Tremors, this forum is a wealth of knowledge, I am thankful for it.
 
Great information. What do you think was your average speed? Also I have a 6.7, it has 11k miles. At 65 mph, I average 20.5 MPG, at 70 mph I average 19.3 MPG. I use no fuel additives, all recommended Motorcraft fluids. Not sure what all this means other than I am close to the same results without the added expense of non stock fluids. I am a big believer the 8K added expense for the 6.7 will pay for itself over a few years in fuel cost savings, not to mention exponentially more torque. I can leave a diesel at idle with AC on in a hot climate with no worry of overheating, I could go on but no need. With respect, every one has a choice based on their needs and financial means. My 2017 6.7 had 106K when I traded for my Tremor. No expense or warranty claim throughout ownership, other than recommended maintenance. No modifications whatsoever and only Motorcraft fluids. I respectfully am only sharing my prior and current 6.7 ownership experience. We all love out Tremors, this forum is a wealth of knowledge, I am thankful for it.
I should have looked to see my average. I’m guessing it was 55-60. It was all a two lane highway into the mountains. Up and over and back down both ways. FWIW I also use motor craft fluids only and no additives 👍 My truck has 4000 miles on it.
 
Awesome thanks Brother, I am in Hartland WI. Also use the Amsoil products.

What speed do you think you averaged? I believe the mileage goes up and down from there. Maybe a tick more if you are going slower and it drops off fast when you are pushing 80MPH
 
What kind of speed were you running?
For the first 300 miles, 65...for the rest, 70. I kept noticing that the RPMs were pegged at between 1500 and 1600. That is the sweet spot. I could take it up to 75 and be at 1600 RPMs, but I kept it at 70. On the way back on Saturday, I am going to do 75 and see what the data says.
 
Towed our 27’ toy hauler yesterday for a round trip of 200 miles and used 3/4 tank in my 2022 6.7. This is in Colorado in the mountains. The dash said 10mpg. Empty I’m getting about 19.7. Trailer weighs about 8000lb and is a huge wind sail. I’ll be swapping tanks as well. Did you change the DTE with forscan or use their tool?
I used their tool.
 
Great information. What do you think was your average speed? Also I have a 6.7, it has 11k miles. At 65 mph, I average 20.5 MPG, at 70 mph I average 19.3 MPG. I use no fuel additives, all recommended Motorcraft fluids. Not sure what all this means other than I am close to the same results without the added expense of non stock fluids. I am a big believer the 8K added expense for the 6.7 will pay for itself over a few years in fuel cost savings, not to mention exponentially more torque. I can leave a diesel at idle with AC on in a hot climate with no worry of overheating, I could go on but no need. With respect, every one has a choice based on their needs and financial means. My 2017 6.7 had 106K when I traded for my Tremor. No expense or warranty claim throughout ownership, other than recommended maintenance. No modifications whatsoever and only Motorcraft fluids. I respectfully am only sharing my prior and current 6.7 ownership experience. We all love out Tremors, this forum is a wealth of knowledge, I am thankful for it.
That is exactly the purpose of the thread here, just to give some data. You also have given some good data as well. I was looking for this type of information when I was purchasing and I couldn't find a lot of it. Hopefully, both our data sets will help someone feel at ease with whatever choice they decide to make. Thanks for sharing!
 
Awesome thanks Brother, I am in Hartland WI. Also use the Amsoil products.

What speed do you think you averaged? I believe the mileage goes up and down from there. Maybe a tick more if you are going slower and it drops off fast when you are pushing 80MPH
When on the highway, I was on cruise the entire way. 65 mph for the first 300 miles, then 70 mph for the rest. I am going to try 75mph for the return trip. I'll post what I find and we'll see how it goes.
 
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