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Old 10-15-2021, 09:32 PM   #1
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New TV MPG. Pretty Good!

I posted about stumbling onto and, buying a new F-250 Diesel a few days back. That thread is here:

https://www.airforums.com/forums/f46...ky-228486.html

Today, I drove about 360 miles from Del Rio to Montgomery, TX. I think that traveling at speeds between 70 and 81 mph and getting 19.6 mpg is phenomenal for a 6.7 Power Stroke!

Folks, that is just about what I was getting with my old F-150 with 10 speed and 5.0 V8. When I hooked onto my boat with the F-150, mileage dropped to 8-9 mpg.

I don't know what the 6.7 Diesel will do when I put a load back there but I bet it will do a lot better than that. Funny thing about the 6.7, it got the best mileage at about 77 mph in 10th gear. Slow down, and the mileage drops slightly.

I think the 6.7 Power Stroke, 10 speed transmission, and 3.31 rear end are a great combination.

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Old 10-15-2021, 11:04 PM   #2
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That’s pretty good but I would divide miles driven by gallons of diesel pumped into the tank. I’ve never had an accurate computer estimation on any vehicle I’ve owned. Usually they're 1-2 gallons too generous, unless it’s a Toyota - then it could be as high as 4-5 off.
Even if it’s a little generous, I’d still be darned pleased with that.
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Old 10-16-2021, 05:37 AM   #3
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Originally Posted by Gotta_Travel View Post
Thatís pretty good but I would divide miles driven by gallons of diesel pumped into the tank. Iíve never had an accurate computer estimation on any vehicle Iíve owned. Usually they're 1-2 gallons too generous, unless itís a Toyota - then it could be as high as 4-5 off.
Even if itís a little generous, Iíd still be darned pleased with that.
Rodger that. I will be doing a manual calculation at the next fill up. I have never had one that was very far off but, this one may be.

I was wondering if this was too good to be true or is the computer accurate?

Wooly
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Old 10-16-2021, 07:27 AM   #4
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I new you would be happy with that truck. I have hand calculated my mpg and the computer is a bit high. Driving 60-65, here in the East, I am getting 24 not towing if I keep my foot out of it. These newer trucks are so much nicer than the older version. When pulling my 25 FC I get right at 15 mpg.
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Old 10-16-2021, 10:11 AM   #5
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That is good. I do not have a Super Duty but my 2017 F150 3.5 10-speed dash computer is 1.3-2.0 mpg off consistently- higher than manual calculation checked after over 100 fill ups. It always says I got 12-14mpg towing. I use Fuelly and have kept the record since the first fill-up. Living in FL and traversing northward to Ohio and throughout the southeast I have averaged 11 mpg towing. It will get 10 and even 12 driving about 65-70 mph. I believe I could eek out 12 if I stayed close to 65 regularly. Sixty miles per hour, maybe even better but I find my speed range comfortable.

I ordered a '22 Hybrid with certain payload sapping features removed. I am looking forward to find out what it gets overall. Towing, perhaps no difference but other ways will be interesting. I keep hearing mixed results as people learn how to get mileage and use the power efficiently. I have talked to several Super duty owners and they usually get about 14-15 mpg - older models towing. Thirty-five percent is about the diesel advantage.
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Old 10-16-2021, 10:26 AM   #6
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Hi

I've found the calculated MPG on both the (gas) F-250 and the (diesel) F-350 to be quite close to reality. This is with stock tires and no other mods. Change the tire size and you will throw off both the speedometer and the MPG. Can you correct that fully with this or that gizmo plugging into this or that port? Reports from the field are a bit mixed .....

Driving on the flat at a consistent (70 to 75 mph) speed, we can get above 21 MPG with a moderately loaded F350 and nothing in tow. A more realistic number for trip planning in varied terrain and with traffic is closer to the 17 to 18 MPG range.

Now, there is this one route down to the beach where the wind normally is behind us. On that route ... wow .... Just don't ask about the MPG on the return from the beach

Bob
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Old 10-16-2021, 11:09 AM   #7
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Mpg

I like to add about 4 fill-ups, close to 1000 miles, when manually checking my fuel mileage. Helps to compensate for slope of fuel islands and maybe not getting full to the same level every time. Great mileage. Maybe time to consider a new TV.
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Old 10-16-2021, 11:17 AM   #8
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I get 15 mpg with my 2019 Duramax work truck. It has 2500 lbs in it at all times. If I go 55 mph I've seen 27.5 mpg fully loaded
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Old 10-16-2021, 02:47 PM   #9
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That is why the vehicle mpg display is called a lie-o-meter.

I know i get 10.5 mpg towing. I reset one trip meter at each fill up. A 56 gallon tank could in theory go close to 600 miles. My personal tank lacks that range so I fill up when I see an easy to get ind out if gas-station (none of the big three truck stops with up to 20% bio-diesel get my business)
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Old 10-16-2021, 06:17 PM   #10
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Quote:
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That is why the vehicle mpg display is called a lie-o-meter.

I know i get 10.5 mpg towing. I reset one trip meter at each fill up. A 56 gallon tank could in theory go close to 600 miles. My personal tank lacks that range so I fill up when I see an easy to get ind out if gas-station (none of the big three truck stops with up to 20% bio-diesel get my business)
Well, I have to say that is true, unfortunately. I did the math when I filled up this afternoon and the mileage was really 17.6. I knew it was too good to be true.

I have had 3 other Ford trucks. This computer lie-o-meter lies the worst of all!

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Old 10-16-2021, 06:20 PM   #11
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(none of the big three truck stops with up to 20% bio-diesel get my business)
When I had my last diesel truck, bio-diesel was not a thing. What is the issue with bio-diesel?

Who sells it and how can you avoid it?
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Old 10-16-2021, 07:57 PM   #12
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Bio-Diesel Pros/Cons

https://www.autolist.com/guides/pros-cons-of-biodiesel

You had me at "gels at 61 degrees and, causes engine damage.

Now, how to avoid it?
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Old 10-16-2021, 08:31 PM   #13
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My Eco Boost bettered that however even my 6.7 6 speed will get that without towing. But with your rear diff gears put a 30 ft trailer on it and enjoy 10.5-13.8 depending on winds hills and weight. Towing will never see 10 gear again-
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Old 10-16-2021, 10:16 PM   #14
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You can adjust the lie-o-meter. It still won't be perfect, but it will be better. No plug-ins or special tools needed. I've done it. It works.

Adjust Lie-O-Meter
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Old 10-17-2021, 07:39 AM   #15
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You can adjust the lie-o-meter. It still won't be perfect, but it will be better. No plug-ins or special tools needed. I've done it. It works.

Adjust Lie-O-Meter
Thanks for that! I learned just recently that you can adjust a lot of things on the Fords.

On my old 150, I had the dealer plug into the computer and turn off the Auto Start/Stop, made all the light stay on using high beam, and some other cool stuff.

It was the After Market guy that told me about this.
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Old 10-17-2021, 08:05 AM   #16
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Your diesel is not broken in yet. Wait till you reach 45,000 - 55,000 miles and you will get in the low twenties!

Pulling my Classic 30 (10,000 lbs) I'm now getting about 13 mpg average!
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Old 10-17-2021, 08:10 AM   #17
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Your diesel is not broken in yet. Wait till you reach 45,000 - 55,000 miles and you will get in the low twenties!

Pulling my Classic 30 (10,000 lbs) I'm now getting about 13 mpg average!
Hope you are right! That will be something to look forward to.
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Old 10-17-2021, 08:17 AM   #18
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Thanks for that! I learned just recently that you can adjust a lot of things on the Fords.

On my old 150, I had the dealer plug into the computer and turn off the Auto Start/Stop, made all the light stay on using high beam, and some other cool stuff.

It was the After Market guy that told me about this.
You can adjust a LOT of stuff yourself. I have turned off Auto Stop and adjusted the number of blinks the blinker does when merging lanes. This one does require a plug-in so you can bluetooth (or USB cable) connect your computer to the truck. The first post has all the necessary information. However, there are hundreds of pages with other information and ideas.

ON EDIT: Make that thousands of pages.

FORScan
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Old 10-17-2021, 12:38 PM   #19
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Originally Posted by Woolecox View Post
When I had my last diesel truck, bio-diesel was not a thing. What is the issue with bio-diesel?

Who sells it and how can you avoid it?
Hi

Who sells it? Pretty much everybody *may* be selling it. Anything under 5% apparently does not require a sticker on the pump in some states. How can you tell if they *are* selling it? Other than a mobile chem lab, there is no way. The folks at the station aren't going to have a clue.

The big issue (just as with ethanol in gasoline) is that the "bio" part likely pulls water out of the air much faster than the normal fuel components do. That water isn't going to help the bits and pieces stay rust free. Water is not what your engine was set up to run on It also can freeze and "stuff" can grow in it .....

Secondary issues like the "bio" part degrading all on its own are possible. (Think of cooking oil going rancid ...). How common these issues are is open to debate. Sorting out water issues from other problems is not as easy as it might seem to be.

How do you avoid it? In many states, it's not at all clear that you can be sure of avoiding it. Pretty much every pump you pull up to has a "may contain 20% bio" sticker on it.

Bob
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Old 10-17-2021, 12:52 PM   #20
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Your diesel is not broken in yet. Wait till you reach 45,000 - 55,000 miles and you will get in the low twenties!



Pulling my Classic 30 (10,000 lbs) I'm now getting about 13 mpg average!

Serious question: why is the break-in period so long on the diesel? Usually by 10k, the rings and valves are seated as good as theyíre going to get.

Thanks,
Phil
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