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Old 06-17-2015, 05:44 AM   #113
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You misunderstood

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Originally Posted by DHart View Post
Yeah... people dying on the roads really messes up the fuel mileage! Hate it when they do that.
Three hours to go three miles is what messes efficiency. I meant to say nothing of the poor soul that lost his life as he drove full speed into the back of a stopped Tractor/Trailer.
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Old 06-17-2015, 05:46 AM   #114
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And do you have a solo mpg figure running same speed on cruise on same roads? Or ?

Percentage drop for towing is?
No, I don't and probably never will.
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Old 06-17-2015, 06:43 AM   #115
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2014 RAM 1500 EcoDIESEL has arrived!

So, towing appears to be from 14-16, overall, at 60-65? Up to about 3k miles towing, now?

As to "never will" if you know the correction factor from EVIC to true (generally a percentage), then a 75-100 mile run at towing speed, but solo with a representative load, would nail it pretty well. (As mpg is indicative of efficiency; a health gauge).

I'm concerned that a drop of more than 40% from solo to towing (other factors the same) is higher than it "should" be.

But, as with the EB Ford half-tons, 40-50% might be the penalty of small motor having to work hard. Versus 30-40% for the bigger TC diesels.

(Yes, EB Ford or EcD Dodge makes up the spread on fuel cost while solo. )

If this is so, that the towing penalty is nearer 50%, then the eight speed transmissions are not delivering what I hoped they would.

That said, it's a far cry from the 6-8/mpg my folks saw with a combined rig that weighed the same as yours. (13k). Or the 10-mpg that my grandparents saw with a high compression big block in the 1960s. But 14-16 is what I see with 17k (same climate & terrain in same speed range).

Unlike the majority of other A/S owners we know that usual culprits to be verified per fuel burn are already "good" on this rig: alignment on both vehicles, tire pressures, bearing and brake pre-set on trailer, plus WDH adjustment.

It's also unlikely that there are CAC leaks on the TV (best reason to note fuel burn past $) or brake caliper drag. That some other EcD Dodge trucks may do "better" in this climate & terrain with a comparable load will have to do with truck spec and tire spec.
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Old 06-17-2015, 09:00 AM   #116
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Quote:
Originally Posted by slowmover View Post

As to "never will" if you know the correction factor from EVIC to true (generally a percentage).

I run a scan gauge II, and have noticed moving from Chevy to Ram that both companies seem to program the EVIC to embellish the results to a certain percentage.
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Old 06-17-2015, 09:22 AM   #117
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I don't have a Scan Gauge, but I did see there is some calibration required for the MPG to be correct.
On the EVIC, it only averages the last 200 miles of driving. At the end of the 900 miles it was showing 14.9 MPG. Pretty close to the hand calculated 15.3 MPG. So, on a tank of fuel in my truck, I could tow 200 miles and the EVIC will show 15 or so, then I can unhitch, drive another 300 miles solo on the highway and it will show 23 MPG. It only shows the average since the last reset, up to 200 miles. The EVIC can be close, but when circumstances change, it can be way off.
That's why I use Fuelly.
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Old 06-17-2015, 11:38 AM   #118
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The ScanGauge has a sort of ongoing calibration scheme. Every time you tell it you filled up, it responds with how many gallons (down to the 10th) it expects you to've put in and you can correct that to the actual. The first couple of times it may be way off but now(after many, many gallons) mine is usually within 1/10th gallon. It keeps track of the tank until you tell it you refilled.
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Old 06-17-2015, 02:29 PM   #119
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I don't have a Scan Gauge, but I did see there is some calibration required for the MPG to be correct.
On the EVIC, it only averages the last 200 miles of driving. At the end of the 900 miles it was showing 14.9 MPG. Pretty close to the hand calculated 15.3 MPG. So, on a tank of fuel in my truck, I could tow 200 miles and the EVIC will show 15 or so, then I can unhitch, drive another 300 miles solo on the highway and it will show 23 MPG. It only shows the average since the last reset, up to 200 miles. The EVIC can be close, but when circumstances change, it can be way off.
That's why I use Fuelly.

I use a page over on Ecomodder to record fuel burn. Haven't updated in a while, but it covers about 50k miles. My eleven-entry log pages on paper started with truck purchase, though.

On my truck the computer does a calculation versus an actual measurement. I've learned that between 55-65 mph that the readout is right at .75 high. I mainly use it to check instant averages by resetting it when a condition changes that interests me. I use an Ultragauge to monitor other parameters (about the same as Scangauge).

Thus, to run 75-100 miles solo with a payload similar to when towing, I've covered enough terrain to give a fair simulation if zeroed from a start.

Thought yours might do the same so we could see the percentage spread from towing to solo, other things being the same. The real average is over several thousand miles, but maybe there'll be a day with a solo trip where part of it could be run at towing speed where the truck is "heavy".
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Old 06-17-2015, 02:29 PM   #120
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Three hours to go three miles is what messes efficiency. I meant to say nothing of the poor soul that lost his life as he drove full speed into the back of a stopped Tractor/Trailer.
I know, you didn't mean disrespect for someone who had died.

It seems drivers these days are worse than they've ever been. Incredibly impatient, aggressive, all jammed together as if that will get them somewhere any quicker, constantly darting back and forth from lane to lane, all while looking down at their critically important cell phone & texts that just can't wait to be dealt with. Incredible.

Not as bad in some of the rural areas, but around the urban areas... it's insane! No wonder people are dying in their cars all the time. All the smart person can do is try to build space ahead of yourself, moderate your speed, keep a lot of space from crappy drivers, avoid changing lanes unless needed, and hope to make it through without getting involved in an accident.

I don't worry much about my mileage... it's staying alive out there that matters most to me.
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Old 08-07-2015, 09:15 PM   #121
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A bit over one year update

Just a couple of pictures.
Arrowhead State Park in Oklahoma.
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Near a lake somewhere in the Ozarks of Arkansas.
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Getting 15 MPG towing is pretty easy. I've towed 5,000 miles with it in the last year. 26,000 miles on the odometer so far.
It is an amazing truck. I love it.
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Old 08-07-2015, 10:11 PM   #122
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So, Top, given the geographical range in which you've been towing, you find 15-mpg to be a "safe" number to estimate fuel burn? For purposes of trip planning, would 14-mpg be the better (conservative) number?

Or is 15-mpg really that easy to achieve, and a solid number for the fuel budget?

.
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Old 08-07-2015, 10:35 PM   #123
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Well, you can look at my Fuelly numbers and see that 15 towing is pretty average. 65MPH on the Interstate will get 16 unless it is very windy.
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Old 08-08-2015, 03:16 AM   #124
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Well, you can look at my Fuelly numbers and see that 15 towing is pretty average. 65MPH on the Interstate will get 16 unless it is very windy.

So it's strong number. That's what I was wondering.
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Old 03-31-2016, 12:21 AM   #125
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We're on the road, first tow of 250 miles with our new Ecodiesel. AZ to NM, mix of interstate and two-lane with many grades 5-6% near 7k ft altitude. What a great towing setup, very capable engine and a transmission that finds the right gear for holding speed up and down. Set the cruise control and enjoy the ride. ProPride hitch distributes the weight with ease and keeps everything rock solid on the highway.

Truck showed 16.7 mpg for the entire trip, with a tail wind on the interstate at 65 mph and through the mountains at 60 mph except slowing for curves. We set the Airstream tires at 65 psi and truck tires at 44 psi because we are a little heavier in the bed than normal after six months (shopping) on the road. Smooth ride, effortless driving, love it.
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Old 03-31-2016, 06:50 AM   #126
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Thanks for sharing Doug. So, would you say it tows in a much more relaxed manner than the Hemi?
I agree that effortless is a good word to describe the Ecodiesel towing experience.
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