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Old 11-19-2016, 08:46 PM   #1
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2017 Dutch Star 4369 Fuel Mileage

After our fifth refueling, I am finding we are averaging 6.5 mpg. This is about 1 mpg less than our 2012 SOB coach with the same engine. Granted, our Dutch Star weighs 8,000 lbs more and our previous coach was 40 foot without the tag axle.

I typically drive 63 mph and most driving is on interstate highways. Our loaded weight is 43,500 lbs.

For comparison sake, what is the fuel mileage on your 2016 or 2017 Dutch Star 4369?

Rex
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Old 11-19-2016, 08:52 PM   #2
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Running a 2015 DS 4369 and getting now about 7.6 to 8 depending on whether I am towing my keep with a HD dresser on a lift on the coach. Have about12K in miles, it was not so good at the beginning.
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Old 11-19-2016, 09:21 PM   #3
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Oops, I failed to mention we are towing a 2015 Cadillac SRX weighing 4,600 lbs.

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Old 11-19-2016, 10:00 PM   #4
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With our 2016 DSDP 4018 we get about 6.5 mpg when towing our 5,000 pound Jeep Grand Cherokee. That's calculated by hand based on roughly 5,000 miles. The on-board system claims 7.5 mpg.
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Old 11-20-2016, 06:09 AM   #5
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Not saying it matters wrt mpg, but do you have a Spartan or Freightliner chassis? (I'm knit picking my own decision due Monday ). Btw, I was told that mpg gets better as you break in the drive train.

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Originally Posted by LK23 View Post
Oops, I failed to mention we are towing a 2015 Cadillac SRX weighing 4,600 lbs.

Rex
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Old 11-20-2016, 06:15 AM   #6
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We have a 2015 DSDP
Get's 7.2 mpg while towing a Buick Enclave.
Approx 13 k miles on engine
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Old 11-20-2016, 06:47 AM   #7
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Not a direct comparison but we just did a 3,000 mile round trip to Texas and averaged 8.1mpg. I guess you pay for that extra 50hp.
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Old 11-20-2016, 07:03 AM   #8
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I don't think there's much if any difference between the engine in your coach and what we had in our 2011 Revolution. We started out at about the same 6.5 mpg, towing a 4500 lb Jeep Wrangler Unlimited. Between 12 and 15k miles we started seeing an increase. From that point I did all my trip planning assuming 7 mpg. Depending on weather and terrain we might get slightly more or less. Altime high was 7.8.
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Old 11-20-2016, 09:16 AM   #9
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We only have 13K miles but have yet to see anywhere near 8 mpg. We tow a 4200 lb car, drive 65 mph and are more in the 7-7.4 mpg range.
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Old 11-20-2016, 09:39 AM   #10
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Make sure that you reset your average mpg display at each fueling and see if your economy is improving. This will eliminate your early "run-in" period which will drag your average down.
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Old 11-20-2016, 10:08 AM   #11
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Don't trust the computed "Average MPG" on the display. It is off by at least 1 MPG, at least in our 4018. I only compute it by hand and not just from one fill-up - typically I use an entire trip to calculate my MPG. I never got above 6.8 MPG that way. I stay within the speed limits, but we do have mountain grades wherever we go.
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Old 11-20-2016, 12:57 PM   #12
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I don't use the trip computer on the dash. I hand calculate my fuel mileage after several refuelings and get the average. So far, it is 6.5 mpg and I have 2,300 miles on our coach.

One difference I notice is that 63 mph was 1520 rpm on our previous coach. On our Dutch Star, 63 mph is around 1600 rpm. That may account for some of the fuel mileage difference.

Rex
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Old 11-20-2016, 02:37 PM   #13
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Rex I wonder if Cummins has power charts that show rpm/torque/gpm type of information. If they do then you might be able to find the sweet spot in the power curve, at least for lab/theoretical situation. As I do my research it seems that just about everything is 7mpg. Ask an OTR driver and many are roughly the same, sometimes lower but not significantly so in most cases.
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Old 11-20-2016, 02:44 PM   #14
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Rex found this. Might be a good read...

cummins_secrets_of_better_fuel_economy.pdf

And #8 on the top 10 list of Best MPG on the ISX15:

Measuring Fuel Economy.
8. Run 50,000 miles (80,467 km) before measuring fuel economy. Early results are not an accurate representation. Tire break-in and effects of first fill can skew the results.

And this chart:

Click image for larger version

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So maybe we just aren't driving enough miles. By the chart we need to get through the first 100,000 miles and you might see 10-12mpg if starting out with a first fill of 6mpg. As Big Mike at Spartan says, "Drive it Like You Stole It!".cummins_secrets_of_better_fuel_economy.pdf
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