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post #1 of 13 (permalink) Old 06-07-2016, 06:09 AM Thread Starter
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Baffling mileage numbers

I've been keeping track of my mileage religiously since I first bought my 2004 Excursion 6.0, both on paper and now with a phone app. Over the course of my ownership, I've averaged about 16MPG both hwy and city. I know that my hwy average is based on my speed, but when I do about 72MPH, I get around 17.5MPG. When towing my trailer (about 7,000lbs or so) I get 12.5 while doing 65MPH.

So here's what's baffling to me. I had to make a trip this weekend pulling the trailer part way and then continuing, and eventually going back to get the trailer. Total mileage was 420. I pulled the trailer 140 miles doing about 65MPH. I drove without the trailer, at 82MPH for 140 miles. I drove back to the trailer, 140 miles, at 70 MPH. I fueled up before picking up the trailer and heading home. Average mileage for the trip was 15.25MPG. The whole way was full of hills, so it's not like I had a lot of downhill. Plus, the pulling and 82MPH should have absolutely killed my mileage. I don't get it. Do you think I just had a hell of a lucky day and the wind happened to be with me at the right times? lol

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post #2 of 13 (permalink) Old 06-08-2016, 11:49 PM
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Re: Baffling mileage numbers

Wind could do it. I like to keep an eye on tall grass and flags to let me know what the wind's doing on a trip. The wind can easily switch on you at any time, and it can make a big difference in fuel use.
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post #3 of 13 (permalink) Old 06-09-2016, 02:07 AM
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Re: Baffling mileage numbers

I consistently got 17 to 18 mpg on the highway in my '05 Ex with the 6.0, and that was at 80mph. Above poster is correct, wind direction is paramount while driving a box down the road. Although I never investigated it, I was always curious about what the drag coefficient was.

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post #4 of 13 (permalink) Old 06-12-2016, 06:33 AM Thread Starter
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Re: Baffling mileage numbers

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Originally Posted by TCNashville View Post
I consistently got 17 to 18 mpg on the highway in my '05 Ex with the 6.0, and that was at 80mph. Above poster is correct, wind direction is paramount while driving a box down the road. Although I never investigated it, I was always curious about what the drag coefficient was.
I WISH I could get that mileage at that speed! I get 18-19 doing 72, but when I hit 80 it goes down to 15 very quickly....and that's with neutral wind. Around here, the wind is usually blowing about 15-20. I know wind at your back can help, wind at the nose hurts, but my numbers were just odd for me.

2004 Excursion 6.0
New HPOP/HPO system o-rings; Updated standpipes and dummy plugs
EGR delete; Rebuilt oil cooler; CCV collection mod
VR Black Diamond head gaskets and ARP studs
Oil and coolant bypass filters; Shell EC-1 coolant
Rebuilt turbo; 250 amp alt; 6000 watts of brain scrambling
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post #5 of 13 (permalink) Old 06-13-2016, 05:01 PM
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Re: Baffling mileage numbers

Pilots have a saying: Any wind more than fifteen degrees off the tail is a head wind.

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post #6 of 13 (permalink) Old 06-19-2016, 08:24 PM
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Re: Baffling mileage numbers

On a long trip, I saw a 3 mpg increase changing the speed from 70mph to 80mph.

At 70mph I observed only one or two psi of boost but at 80mph the boost had increased to about 4 psi.

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post #7 of 13 (permalink) Old 06-20-2016, 04:28 AM Thread Starter
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Re: Baffling mileage numbers

Quote:
Originally Posted by leojr View Post
On a long trip, I saw a 3 mpg increase changing the speed from 70mph to 80mph.

At 70mph I observed only one or two psi of boost but at 80mph the boost had increased to about 4 psi.
An increase by increasing speed??

2004 Excursion 6.0
New HPOP/HPO system o-rings; Updated standpipes and dummy plugs
EGR delete; Rebuilt oil cooler; CCV collection mod
VR Black Diamond head gaskets and ARP studs
Oil and coolant bypass filters; Shell EC-1 coolant
Rebuilt turbo; 250 amp alt; 6000 watts of brain scrambling
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post #8 of 13 (permalink) Old 06-20-2016, 02:02 PM
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Re: Baffling mileage numbers

perpetual motion may have been discovered!


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post #9 of 13 (permalink) Old 06-22-2016, 02:05 PM
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Re: Baffling mileage numbers

I'm sure he's saying that his mileage increased at 70 mph compared with 80.

His boost tells the same story, 1 or 2 psi at 70 mph vs 4 at 80. The engine has to work harder at higher speeds to push more air out of the way and accommodate the increasing friction in the engine and tires, etc.

It's all pretty linear: the faster you go, the more you pay.
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post #10 of 13 (permalink) Old 06-22-2016, 02:35 PM
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Re: Baffling mileage numbers

yep! those higher speeds resulting in higher oil, coolant, tranny, diff, & tire temps are paid for with fuel


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