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Old 11-29-2020, 01:22 PM   #1
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Fuel Mileage

Realistically What should I expect for Fuel Mileage on a 21' Dutch Star 4369.

Trying to plan my trip to pick it up 2,600 miles home.
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Old 11-29-2020, 01:31 PM   #2
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It’s all speed dependent for me. At 70 mph, normally between 6.0 to 6.3 mpg. At 65, I get around 6.7 to 7.0 mpg towing. Not much of a difference if not towing unless you are in the mountains.
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Old 11-29-2020, 01:42 PM   #3
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Thank You. I put 6.5 on Trip Wizard but really only had what the dealer told me. which was 8-9 so I figured they all lie about 30%
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Old 11-29-2020, 01:47 PM   #4
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My 2019 4018 has averaged 6.6 over 15K miles. Ask the dealer to put 8 mpg in writing and they'll pay the difference of anything less....see what they say then!

There hasn't been a DS made in the last 7-8 years that gets that.
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Old 11-29-2020, 02:49 PM   #5
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Hi - 6.8 here but in the hills of Vermont expect less. The computer did one time show 100 mpg but that was downhill with a tailwind.



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Old 11-29-2020, 03:41 PM   #6
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Getting 6-6.5 in my new 4369 with 450 Cummins at 70mph, on gentle rolling hills and flat land terrian.

Played with cruise control 2 nights ago on a lonely road and running 55 mph at 1500 RPM was getting 9-10.5 mpg in 6th gear on the Allison tranny. Could never do that on the Interstate without making Lots of folks mad...

Hope that helps.
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Old 11-29-2020, 05:16 PM   #7
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Quote:
Originally Posted by Terry Nay View Post
Getting 6-6.5 in my new 4369 with 450 Cummins at 70mph, on gentle rolling hills and flat land terrian.

Played with cruise control 2 nights ago on a lonely road and running 55 mph at 1500 RPM was getting 9-10.5 mpg in 6th gear on the Allison tranny. Could never do that on the Interstate without making Lots of folks mad...

Hope that helps.
Thank everyone for Quoting, I own 6 Freightliner dump truck all with Detroits
Do alright empty but put a load of any type on them and the bills being to roll. I thought 6 or 7 would be good but really was thinking you's all comes back with 5.
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Old 12-01-2020, 07:49 AM   #8
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So did u go with a Spartan then...lol..
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Old 12-01-2020, 08:05 AM   #9
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Your engine isn't really broken in, yet. Figure 7MPG.


Your engine is very similar to mine. Here is some information you may not have seen.
https://www.rvtechlibrary.com/engine/ISL400_specs.pdf



Our rig has 33,000 miles on it and we have averaged 8MPG over that distance. What speed you drive at will definitely affect fuel economy. On interstates we are typically running at 1700-1800 RPM. This gives us enough HP and torque so that hills are taken in 6th gear. In mountainous areas, I shift down at 1600 rpm as needed. When possible, we prefer secondary roads where the speed limit is usually lower. Fuel economy at 55MPH in flat to gently rolling terrain is well over 9MPG. "YMMV".


Try to think in terms of smiles per mile! - When you can. -Paul
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Old 12-02-2020, 07:48 PM   #10
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At delivery, I was told 6.3 mpg. This has proven to be correct. I asked if it would improve after engine break-in. He said there is no engine break-in, but there is a chassis break-in. It should go up by about 0.5 mpg after 20k miles. We'll see. 15k more to go.
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Old 12-03-2020, 12:13 AM   #11
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Fuel Mileage

Ď02 Dutch Star 40ft, Cat 330, 35K Lbs incl toad
Iíve done 7.5 mpg average over the last 40K miles, about 8-1/2 years. That is true mpg, I extract the generator fuel in my spreadsheet. The toad is always attached.
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Old 12-05-2020, 02:46 PM   #12
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Fully loaded it weighs just under 45K lbs. When new 6-6.5 mph and now getting 7.25-7.5. Set cruise control at 65 on the hwys. Head and tail winds really affects these numbers.
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Old 12-05-2020, 03:36 PM   #13
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6-7 mpg is about right on a newer DS. You will probably now get a bunch of people bragging about always getting 8+ which is BS.
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Old 12-05-2020, 05:37 PM   #14
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Never thought Iíd disagree with Dutch Star Don, but below is a photo from the dash of my 2018 DS 4018. The two odometers were reset prior to a trip from SoCal to Galveston and back so the mileage and distance are for the same trip. Getting out of SoCal took us over 4400í passes and coming back via Flagstaff, AZ we were at 6900í or so. Gas purchases confirm the accuracy of the trip computer. Days in flat areas of TX the dash showed up to 8.4mpg for a 250+/- mile day. All this includes towing a Subaru Forester. So 3725 miles w/ 8.1 mpg.



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