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Old 07-16-2016, 02:42 PM   #43
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This is probably a little off topic since we're talking about how to best calculate MPG - but I'll post it anyways ....

I built myself a little Fuel Cost Calculator that I use when estimating fuel requirements for a trip. It's a simple little Excel spreadsheet. I provide it with the # of miles I expect to travel, the number of days I expect to be gone, the # of days I expect I'll be using my generator (and the # of hours I expect I'll run it each of those days) and the anticipated fuel costs per gallon.

I also enter my assumptions regarding the # of gallons of fuel the generator uses per hour, the # of gallons the Aquahot uses per day and the anticipated MPG of for the coach engine.

Using those inputs - the spreadsheet calculates the total # of gallons the coach motor, the generator and the Aquahot will each use over the course of the trip - along with a total # of gallons of fuel and the anticipated total cost. Obviously it ain't rocket surgery or brain science - but I find it does come in pretty handy when I'm estimating fuel costs as I'm planning a trip.

Here's a screen capture of what it looks like when opened in Excel. If you'd like a copy - you can download it at the following link: Spacenorman's Fuel Cost Calculator


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Old 07-16-2016, 07:20 PM   #44
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Well we traveled 382 miles today, kept it around 65 and was able to get 7.8mpg from TN to Ohio. This was with towing a Honda. Click image for larger version

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Old 07-16-2016, 09:29 PM   #45
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SpaceNorman, post 43, I simply estimate 50 cents a mile and that comes out more than your estimate but if I have to change fluids or service the RV while on the trip it is pretty well covered. I just finished an around the USA trip at just under 10,000 miles and had oil & lube service at 7000 miles was covered but by that but I had $2100 in repairs along the way and that came out of entertainment expense. Ouch! I started the 50 cents a mile estimates a couple years ago when diesel was well above $3.00 a gallon and it seemed pretty close then.
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Old 07-16-2016, 09:31 PM   #46
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Quote:
Originally Posted by deandec View Post
Did Cummins mean Correct fuel mileage or Best fuel mileage.

MPG is MPG, however far you go.

Fuel burned at a dead stop is 0.0 MPG.

Performance wise, we used to think our mpg improved once the diesels hit the magic 30,000 miles break-in point. Not sure we ever proved that in our otherwise busy days.
Correct fuel mileage

Our ISC improved in both performance and fuel mileage after 25,000 to 30,000 miles
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Old 07-16-2016, 09:33 PM   #47
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Originally Posted by JMonroe View Post
I think 7.4 is very good for the size and power of your rig.

I always did my trip planning, when we had the 2010 Revolution - 450hp DEF engine, at 7mpg. Occasionally it would be a bit worse, occasionally a bit better, but over any distance 7 seemed to be where we'd land.

I've only got 2,000 miles on our new coach, Cummins 600hp. Looks like it will be safe to use 7mpg for planning purposes again. We ranged from 6.8 to 7.3 on the various legs of our recent trip. Frankly, I was very pleased to see anything that high on a new engine of that size and power
I agree and I'm happy with 7.6 on ours! That's not much less than we got with the '02 DSDP with ISC.
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Old 07-16-2016, 09:53 PM   #48
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Why do you waste a whole thread on mpg, it's never going to be great towing or driving an RV. Get used to it!
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Old 07-16-2016, 09:53 PM   #49
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Quote:
Originally Posted by deandec View Post
Did Cummins mean Correct fuel mileage or Best fuel mileage.

MPG is MPG, however far you go.

Fuel burned at a dead stop is 0.0 MPG.

Performance wise, we used to think our mpg improved once the diesels hit the magic 30,000 miles break-in point. Not sure we ever proved that in our otherwise busy days.

Fuel burned at dead stop would be zero.....if the engine was off....otherwise wouldn't it be a negative number?

I used to watch my MPGs but all it did was give me something else to stress over. Now I just drive and when it gets to a half tank I put another hundred gallons in.

I can figure in my head about how much I will use on a given trip in my head. I no longer need all the bookkeeping. Take care and just have fun.


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Old 07-16-2016, 10:12 PM   #50
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I use 6 mpg for budgeting. That covers some generator and Hydro-hot use. Next trip is 2400 mi, or 400 gal, hopefully @ 2.50 or less. $1K is still pretty cheap compared to a fly/drive vacation. Not to mention that boarding fees for 17 days would well exceed $1K.
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Old 07-17-2016, 10:40 AM   #51
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We have a 2014 Thor Palazzo 36.1 and have been averaging just under 11 mpg. Seems to be consistent whether with our toad or not.
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Old 07-17-2016, 11:37 AM   #52
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That's a loaded question. So many factors involved, weight, engine size, speed, road conditions etc.

My C7 averages 7-8.5 mpg (60-62 mph) towing our HHR.
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Old 07-17-2016, 06:21 PM   #53
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SpaceNorman, very interesting form for calculating fuel use and cost. The only thing I would add would be idle time. If you stop to RON several times during the same tank of fuel, that time can add up...park, set up, tear down, etc. I start my idle time when we stop at the CG office. The time it takes to go from there to our space is included...it's never far and never fast. When leaving, idle time ends when out of the CG on on a highway.
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Old 07-17-2016, 06:44 PM   #54
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Old 07-17-2016, 07:08 PM   #55
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With a 400 ISL our long term average towing a Jeep Wrangle is 7.7MPG. It's always better going downhill.
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Old 07-18-2016, 06:26 AM   #56
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Quote:
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...The only thing I would add would be idle time. If you stop to RON several times during the same tank of fuel, that time can add up...park, set up, tear down, etc.
Interesting point ... I've never really given much thought to idle time. I tend to keep idling to a bare minimum. My coach has a MaxxForce engine that works with a regen system (rather than DEF) ... and my perception is that letting the engine idle any more than absolutely necessary will increase regen requirements. I'd guess that in most cases I don't spend more than 15-20 minutes idling in association with a campground stop (combined idling upon arrival and idling in preparation for departure).

I'll have to do some googling and see if I can identify a "fuel burn @ idle" figure for my coach engine. .. and then noodle how to best separate gallons spent idling in order to calculate moving MPG. Currently, the MPG # I use when calculating fuel estimate is essentially an average of "cherry picked" trips where my calculated MPG (calculated the old fashioned way of Total Miles Drive / # of Gallons replaced) of the MPG observed on selected trips that I know didn't involve the use of the Aquahot and/or generator. Obviously this isn't an exact science.

Thanks for the suggestion! If/when I revise my calculator - I'll repost.
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