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jaycocreek

Idaho

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Posted: 06/20/19 01:15pm Link  |  Quote  |  Print  |  Notify Moderator

noteven wrote:

Anyone with a gasohol engine ever compare $/mile using 91 vs 87?


In my opinion,they just got a little better each year..As mentioned above,the 70's vintage big blocks were horrible for mileage yet the ones I've had in the 90's do pretty good if you keep your foot out of it....My old '76/454 in my last rig didn't ever see 10 mpg empty or loaded...

They came along ways in mileage in the late 80's and early 90's compared


'94 Ford DRW/460
Lance 9.6
Yamaha Rhino in tow
Elk hunt'n Idaho

Kalabin

Alaska

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Posted: 06/21/19 12:09am Link  |  Quote  |  Print  |  Notify Moderator

noteven wrote:

Anyone with a gasohol engine ever compare $/mile using 91 vs 87?


With my V10 I usually see 8-10mpg depending on terrain, I have tried 90 (we don't get 91 up here) in my truck with a 5-star tune and noticed no MPG difference.


2009 Ford F350 V10 4.10 FX4 Crew Cab SRW
2018 Wolf Creek 840 : Timbrens, Fast Guns

Grit dog

Black Diamond, WA

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Posted: 06/21/19 09:12am Link  |  Quote  |  Print  |  Notify Moderator

jimh425 wrote:

SidecarFlip wrote:

Don't think I've ever run my truck at 80. Way too fast for a sane person


I’m not sure if I’d feel safe at that speed with your truck either, but 80 is just the speed limit in parts of some Western States with minimal exits, minimal traffic, and the biggest concern being wildlife. No, you don’t have to go that speed, but I don’t think every pickup driver I see is insane.


Lol. 80mph??? That's crazy bro!
Fark, if you can't drive 80mph you could have another birthday crossing Montana!


"Yes Sir, Oct 10 1888, Those poor school children froze to death in their tracks. They did not even find them until Spring. Especially hard hit were the ones who had to trek uphill to school both ways, with no shoes." -Bert A.

JimK-NY

NY

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Posted: 06/21/19 01:39pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

jimh425 wrote:

SidecarFlip wrote:

Don't think I've ever run my truck at 80. Way too fast for a sane person


I’m not sure if I’d feel safe at that speed with your truck either, but 80 is just the speed limit in parts of some Western States with minimal exits, minimal traffic, and the biggest concern being wildlife. No, you don’t have to go that speed, but I don’t think every pickup driver I see is insane.


Lol. 80mph??? That's crazy bro!
Fark, if you can't drive 80mph you could have another birthday crossing Montana!

I have crossed the country including Montana numerous times. I doubt I have ever hit 80 mph. When I had 19.5 wheels and tires the speed rating was 70. Tires are a big concern in the heat with a heavy load.

Kayteg1

California > Nevada

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Posted: 06/21/19 02:36pm Link  |  Quote  |  Print  |  Notify Moderator

When I usually set CC at 60 mph, when I am bored on flatland, I "catch" big semitrailer and drive in its tailwind. That sometimes is reaching 80 mph, but usually I go 70-75 mph and the drag covers for speed mpg penalty.
Meaning I can follow the semi at 75 mph and still burn the same fuel I do, while driving 60 mph alone.
Turbulence is a bit uncomfortable, but that keeps me from sleeping on boring drive.





jimh425

Western MT

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Posted: 06/21/19 04:55pm Link  |  Quote  |  Print  |  Notify Moderator

Yeah, if you’re tailgating semis, wrecking on your own due to speed is the least of your worries. I bet that semi was happy to contribute to your MPG, right? [emoticon]

70 in a 80 is much better than 60. The difference in speed is what makes the slow speed more dangerous than going a little faster. Of course, you can always just hit one of the backroads to go 60.


'10 Ford F-450, 6.4, 4.30, 4x4, 14,500 GVWR, '06 Host Rainer 950 Dbl Slide, Torklift Talon tiedowns, Glow Steps, and Fastguns. Bilstein 4600s, Firestone Air Bags, Hankook DH-01 225/19.5 Fs, Curt front hitch, Energy Suspension bump stops.


noteven

Alberta

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Posted: 06/21/19 10:00pm Link  |  Quote  |  Print  |  Notify Moderator

Kayteg1 wrote:

When I usually set CC at 60 mph, when I am bored on flatland, I "catch" big semitrailer and drive in its tailwind. That sometimes is reaching 80 mph, but usually I go 70-75 mph and the drag covers for speed mpg penalty.
Meaning I can follow the semi at 75 mph and still burn the same fuel I do, while driving 60 mph alone.
Turbulence is a bit uncomfortable, but that keeps me from sleeping on boring drive.


Some drivers stress about drafters. Enough to do without someone rear ending them etc etc.
Small vehicles tailgating me in a truck never bother me - I figure the ass end of my trailer(s) are more rugged than the plastic front end of a car or pickup and hitting me from behind is on the tailgater.

Current 60mph to 0mph is what, 265ft for a 80k 5 axle truck? This is exponentially longer as speed increases. I guess if you see his brake lights right away you won’t hit him that hard when he stands on the binders in a situation....

Kayteg1

California > Nevada

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Posted: 06/21/19 10:47pm Link  |  Quote  |  Print  |  Notify Moderator

The trick for easy going in draft is to set CC and only click +- 1 mph when needed.
This way no gas pedal fanning and my foot is always ready to hit the brakes.
I follow with about 50' distance, what gives me plenty of room even for emergency braking.
Physics say that the front vehicle takes as much of front draft as rear vehicle takes the rear draft. So my tailgating saves the semi some fuel as well, but doubt in the amount he can notice, when for me tailgating at 70 mph gives 20-25% fuel saving.
Again, I don't do that often as my main purpose is to see the country, but when you drive 1500 miles in Texas having the same landscaping, that is where technique becomes handy.

jimh425

Western MT

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Posted: 06/22/19 05:30am Link  |  Quote  |  Print  |  Notify Moderator

No, 50 ft isn’t far enough, but don’t take my word for it. This graphic is for 55. If it isn’t obvious, at 75 or so, the distance would be even farther.

[image]

NRALIFR

Truck Camping Out West

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Posted: 06/22/19 06:40am Link  |  Quote  |  Print  |  Notify Moderator

What matters to me is the total cost of operating the truck over time. Most of the time (~99%) the camper is on the truck, so I may see MPG’s as high as 12.5 (downhill, tailwind, ideal driving conditions, etc) and as low as 6 (chugging up a steep grade, during regen, speeds above 65, etc).

I used to keep track of fuel mileage in my older trucks with handwritten logs. Even after vehicle’s started displaying MPG on the dash, they didn’t seem to be that accurate all the time. On both my 2010 and 2016 F450’s though, I hand calculated the fuel mileage for the first few months I had them and eventually concluded that what the truck was displaying was pretty accurate, so I quit doing it manually.

This display showing the average MPG I’ve never reset. I’m not sure how many miles it’s averaging, but it has to be several hundred at least. Or maybe it’s every mile I’ve put on the truck. All I know is I have to drive several hours at an MPG higher/lower than it’s displaying before it will tick up/down .1 of an mpg. As far as I’m concerned, that’s what my average MPG is for this truck. Keep in mind that most F450 pickups have a 4.30 axle ratio. I think they could be ordered with a 4.80 as well, but those are pretty rare.

[image]

I use the trip odometers to get a more focused idea of what my MPG is. The “A” trip odo is where I keep track of how long it’s been since the last regen. When the regen starts, I’ll reset it and keep an eye on the mpg. It will be significantly lower than normal during the regen process, and will start going up noticeably when the regen stops. Between this, and the DPF soot load screen, I can keep pretty close track of what’s happening. The “B” trip odo is the one I reset a lot.

[image]

[emoticon][emoticon]

* This post was edited 06/22/19 07:52am by NRALIFR *


2001 Lance 1121 on a 2016 F450


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