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MPG


remoandiris

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Out here in the West it's hard to pin-down a real number when it comes to MPG due to so many variable factors .......altitudes and steep, curvey roads really skew any effort to obtain stable numbers..........

 

Example......our best record for MPH from Reno to Las Vegas to Reno with our small 30 ft Dolly-hauler is 13.2 MPG .......Fast forward to last spring........ same road cool temps far less traffic HORRIFIC headwinds up to 70 mph at times we set a new low record 8.2 MPG and this is with a tiny fuel miser M11 at 370 hp setting .......this trip we drove the same 62 mph on cruise but much of the time the turbo boost gage was hovering at mid-range but consider at a average 40 to 50 mph headwind our "Airspeed" was hovering in the 100 mph to 110 mph range....of course our tire and drive train friction was still factored at 62 mph on cruise.....so the downgrade in MPG was aero-drag......

 

A aero-cab truck has a big MPG advantage but high-headwinds can really eat away some of the advantages.......

 

Drive on...........(Or....pull over and let the headwinds die down........)

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Bobtail from Calgary to Dallas area when I picked up my truck I got just over 12 mpg. Running at 65mph on cruise. D16 engine. Anctual measured gallons, not computer.

 

With a 53K lb load I typically get BEST at low to mid 9's. Again running at 62 mph.

 

More typical in any hills/mountains is in the low 7's. Running at 62 mph or the speed limit, whichever is lower.

 

Those are measured figures - NOT the computer. The computer tends to be optimistic on most trucks.

 

This is about what I'd expect for my truck in those conditions.

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Our computer is optimistic as well. I usually says around 9...... Round trip to Alaska was 7.15 using real numbers. But, we have a motor issue we're sorting out, so it may improve.

 

That said, if you don't drive a lot of miles, a couple of mpg is pretty insignificant in the big picture. If I can't afford the fuel, I'd better find a cheaper game.

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Our computer is optimistic as well. I usually says around 9...... Round trip to Alaska was 7.15 using real numbers. But, we have a motor issue we're sorting out, so it may improve.

 

That said, if you don't drive a lot of miles, a couple of mpg is pretty insignificant in the big picture. If I can't afford the fuel, I'd better find a cheaper game.

 

EX-perts are mumbling about $.99 diesel............

 

Drive on..........(Cheep is a good trip....)

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Our truck has an ISX Cummins and though we haven't weighed it we probably cross the scales at about 50,000 pounds. Loaded with the Forester, the RZR and the Teton we have averaged between 7 and 8 usually around 71/2 to 8. This has not changed much in 10 years. We live in a valley in Colorado so no matter which way we go the trip starts with mountain driving.

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Maiden voyage, Houston through Colorado, Wyoming, Montana, South Dakota and back. I did 8.7, actual, from the driveway to the driveway. I've never measured it since. I watch the dash computer but haven't really cared a lot about it since. I've only put 20,000+ miles on my truck since I bought it. Even if it drops 1.5MPG to 7.2 it's not going to matter enough to make me change my plans.

 

20,000 miles at 8.7MPG at $4.00 per/gal is $9195.40 or 0.46 cents a mile

20,000 miles at 7.2MPG at $4.00 per/gal is $11,111.11 or 0.56 cents a mile

a difference of $1915.71 over 20,000 miles or 0.10 cents per mile

 

at $3.00 per/gal that changes to $6896.55 at 8.7 and $8333.33 at 7.2, a difference over 20,000 miles of $1,436.78 or about 0.08 cents a mile.

 

Yee haw, watch those diesel prices drop. I'll be eating filet mignon with that extra 2cents a gallon. It will only take me 27 gajillion miles to save enough for two steaks and a drink. Shoot, I might even be able to afford an appetizer :D

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Towing 18.5k lbs- 10-10.5mpg

Bobtail 12-14 depending on how much traffic, stop and go etc.

BUT this is a PRE-EGR, extra emission, catalytic converter, small Cummins M-11.

In a 1 year average, we have gotten around 11.8mpg. All fuel in, measured miles, etc.

I do know that we are getting a little lower mpg with the new tires- different tread, compound etc.

Need to figure in the different fuels as well. B-20 will get you less mpg than straight diesel would. Remember that right now everyone is running "Winter Blend"...

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Yee haw, watch those diesel prices drop. I'll be eating filet mignon with that extra 2cents a gallon. It will only take me 27 gajillion miles to save enough for two steaks and a drink. Shoot, I might even be able to afford an appetizer :D

 

Phil,

 

I like the way you expressed it better than mine. ;)

 

As I see it, we aren't playing a cheap game. Sure, I like to save a buck, but I won't sweat economy over safety. It's just a little less to leave for the kids to squander when we're gone. :lol:

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Glenn, It will be interesting to see what you get as we have similar trucks, Freightliners with 14L Detroit's and Ultra Shifts.

 

Ours is a Mid Roof XT and Singled short. I think yours was a condo and you were singling Mid.

 

We got around 11 MPG when we drove it home from Houston to MN bobtailing, which was the longest trip we did bobtailing.

 

Hooked up to our 18k trailer, we were getting 7-8 MPG until we added an extra wind deflector/garage on the back of ours to close up the gap to the trailer and we went up to 8-9 and in some cases 10MPG this year. Weight of the trailer can vary by as much as 7k (if we have the show vehicle in there or if we don't) and it doesn't seem to affect mileage.

 

A lot does depend on how much headwind we are getting and how much Non-expressway driving we do, In town traffic and wind affects the MPG's greatly. We usually run the expressways at 65mph or slower due to trailer tires.

 

If would be nice to change out the rear end ratio like Gregg did to the truck in the video but we would have to drive a lot of miles to make it worth while. I just hope that when we are back traveling in the spring/summer, today's fuel prices will still be here or lower! That is better on the pocket book than any increase in MPG.

 

Dave

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I will agree on the "pay to play" statement! And most of us get better MPG than our counter parts using pickups to tow their RV's. But those that say it's part of owning an HDT, bad mpg. I do not agree with, when you compare us to the diesel pusher crowd. They usually get 4 to 6 mpg, how many of us would still make the same statement with those mpg numbers? I bet most if not all would be looking to improve those numbers! Or would not go the HDT route at all? Remember, not all of us have $100k rigs or would choose to spend that amount on just a "truck". So the mpg statement is a valid concern for some, not me. But some.......

 

Curt

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I bobtail about 20,000 miles a year. Lots of times 6-800 miles at a clip. Many variables, but 9.5 - 10 mpg are good numbers at 65 mph. The Work and Play is a brick behind me, totally flat front, gap between tractor and trailer is at least 8 feet yields about 8 mpg. Aerodynamics is a much bigger factor than weight.

 

my best mileage with a trailer is an empty food grade tanker(no piping underneath and one small ladder on the side) with super singles goes 9 under average conditions.

I recently had a 53' hi-cube van produced by Kentucky trailer for Pepsico/Frito Lay that had every aerodynamic trick in the book installed. From Louisville Ky to their HQ in Dallas driving very carefully( 55 mph, minimum stops) I got 9.5 mpg.

There is a picture on the first page of my Flickr page.

https://www.flickr.com/photos/118502133@N04/

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I track my mileage on paper at every fill-up. Since I have bought my truck, I have put on 15016 miles, and put in 1766.7 gallons of fuel. That is right at 8.5mpg. This is with all kinds of driving (around town, pulling loaded and unloaded trailers, bobtail) ALL of which is mountain driving in Colorado/Utah/Wyoming.

 

This is with a Detroit 12.7, and a Condo. I usually set the cruise at 70. (speedo is 5mph off per GPS, so 65)

 

And comparatively, I was only getting 7mpg pulling the same trailer/load with my Cummins Dodge. I just figured out the actual mileage the other day, and I was quite surprised that it was over 7.

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I track my mileage on paper at every fill-up. Since I have bought my truck, I have put on 15016 miles, and put in 1766.7 gallons of fuel. That is right at 8.5mpg. This is with all kinds of driving (around town, pulling loaded and unloaded trailers, bobtail) ALL of which is mountain driving in Colorado/Utah/Wyoming.

 

This is with a Detroit 12.7, and a Condo. I usually set the cruise at 70. (speedo is 5mph off per GPS, so 65)

 

And comparatively, I was only getting 7mpg pulling the same trailer/load with my Cummins Dodge. I just figured out the actual mileage the other day, and I was quite surprised that it was over 7.

If I am reading that right, if you put 15,016 miles on your truck based on a speedometer that reads 70 when your going 65 according to gps, then I think you actually put 13,943 miles on the truck using 1766.7 gallons of fuel. That is an avg of 7.9 mph.

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I track my mileage on paper at every fill-up. Since I have bought my truck, I have put on 15016 miles, and put in 1766.7 gallons of fuel. That is right at 8.5mpg. This is with all kinds of driving (around town, pulling loaded and unloaded trailers, bobtail) ALL of which is mountain driving in Colorado/Utah/Wyoming.

 

This is with a Detroit 12.7, and a Condo. I usually set the cruise at 70. (speedo is 5mph off per GPS, so 65)

 

And comparatively, I was only getting 7mpg pulling the same trailer/load with my Cummins Dodge. I just figured out the actual mileage the other day, and I was quite surprised that it was over 7.

Beyerjf;

 

You are right on, on that topic. With our prior TT a 30ft Airstream Sovereign I never saw mpg below 11, with the Sprinter I have seen in the mpg in the 9's. This was based on the same routes on an average.

 

Curt

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If I am reading that right, if you put 15,016 miles on your truck based on a speedometer that reads 70 when your going 65 according to gps, then I think you actually put 13,943 miles on the truck using 1766.7 gallons of fuel. That is an avg of 7.9 mph.

I'll go out on a limb, and say that if he's using a GPS for speed check, then he likely also used it for distance check.

 

A speedometer can be off while the odometer is accurate on the same machine. In days of old, the odometer was gear driven, while the speed portion was actually driven by a spinning magnet inside an aluminum cup.

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