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Old 03-15-2017, 07:18 PM   #1
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Better fuel mileage with 2010 Dutch Star 400 Cummins

I'm getting between 6 and 6 1\2 miles per gallon. Just was wondering if anyone is doing any better.Have not ask dealer yet what I might do.
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Old 03-16-2017, 05:47 AM   #2
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Unfortunately, I think our MH's get what they get. MOL

Are you driving in the sweet spot? For a lot of rigs I've heard people say it's around 62 mph.
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Old 03-16-2017, 06:34 AM   #3
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On my 3rd Diesel Pusher. have gotten in the 5s and as good as 7. (with and without towing a vehicle).
They are big heavy vehicles. Good Mileage is not their strength. Or maybe I should say take what you get and enjoy the rest of the ride!
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Old 03-16-2017, 06:39 AM   #4
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I'm getting between 6 and 6 1\2 miles per gallon. Just was wondering if anyone is doing any better.Have not ask dealer yet what I might do.
It takes about an hour of running for my Cummins 450 to warm up and then I am in the neighborhood of 7 to 7.3 mpg. (Highway only) I try to stay away from urban areas as much as possible because I drop down to the high 5s or low 6s for mpg then.

However, I went to Newmar last October from lower Alabama with a toad on Tow Dolley and averaged 9.3. Could of not been more pleased based upon posting I read from this site.

As a note: An OP person by the name of Dutch Star Don recommended a fuel additive for diesel that I now swear by: Opti-Lube XPD. I run about 2 gallons a year through system. I get it from: https://devine-diesels-store.myshopify.com/ [due to free shipping for two gallons and no tax]

Just know fuel additives and their use is a personal choice only for me.
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Old 03-16-2017, 07:10 AM   #5
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I am getting 8.1 mpg with my ISL 400.
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Old 03-16-2017, 12:57 PM   #6
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On my 2011 ( EPA 07 particulate filter/muffler) DSDP 4020 with the ISL 400, I get about 8.2 mpg by pencil & paper, going ~62 mph with the toad. ( long time average). I have about 40k miles on the MH.
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Old 03-17-2017, 05:10 AM   #7
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I get a solid 7.6mpg on my 450 ISM @63mph towing my CRV. (this is based on my onboard computer, I really need to do a stubby pencil method to verify it)
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Old 03-17-2017, 07:22 AM   #8
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Its all about how and where you drive. Wind has a big influence too. I drive as much as possible with the cruise control. I average between 7.9 to 8.9 towing a CRV. I try to maintain 64 mph.
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Old 03-17-2017, 01:29 PM   #9
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...Its all about how and where you drive. Wind has a big influence too....
That's if all things are equal. Each rig is going to have it's best, average and worst. Unfortunately some rig's never get 8mpg.
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Old 03-17-2017, 01:45 PM   #10
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Yup you will get what you get for mileage.
Our coach weighs 42k, with a "warmed up" 450 Cummapart..
The gearing is such that the Alison doesn't shift into the top overdrive gear until 65/67 mph.
Average mpg (with Scion "xB Toadster" @ 68mph runs from low of 6.5 to nearly 9 mpg depending on terrain and traffic.
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Old 03-20-2017, 05:31 AM   #11
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.....Have not ask dealer yet what I might do.....
Whatever you do..... don't let them talk you into a flux capacitor.
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Old 03-20-2017, 06:28 AM   #12
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put an Aero muffler on, that will increase power and MPG
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Old 04-18-2017, 09:10 AM   #13
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Thanks for all the comments. There are variation factors for sure with terrain and wind. I really don't notice much difference whether pulling the tow dolly or not. However, I did find the 'sweet spot' on my 400 cummins engine. If I cut my speed down to about 60-62 mph the engine just shifts into 6th gear and then I do get an average of 7.9-8 mpg. If I kick it up to 70 mph then I go back to 6-6.5 mpg. So best to slow down and enjoy ride and just let the fast pace traffic pass me by!
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Old 04-18-2017, 09:41 AM   #14
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I have found the best way to increase mileage is to only drive down hill with a tail wind.
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