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Old 06-20-2016, 02:03 PM   #81
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Noise

Well, that is interesting. The sound is not bad a about 50, but becomes a low roar at 60. It might be road noise because the roads in Washington and Oregon are really deteriorating fast. So, it could be just that simple.

Keithe, did you get that milage when it was new?

I do apologize for getting off the subject.
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Old 06-20-2016, 02:10 PM   #82
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We started out at about 11 mpg when we drove the RV from Ohio to Oregon but we also encountered high winds in the trip. Since then, our mph has steadily increased. Our last two trips where constantly over 15 mpg.


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Old 06-20-2016, 02:53 PM   #83
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Cabover Noise

While never being anywhere near loud as noted above, the Sumo's really made it quiet and smooth.
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Old 06-29-2016, 06:41 PM   #84
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Here are the mileage stats from our just completed 2440 mile round trip from the Twin Cities, MN through WI, IL and MI to Ontario, up around the Great Lakes staying on the Canadian side, through Thunder Bay and back down the MN North Shore to the Twin Cities.

Here is the data:

Date Odometer Miles Fuel MPG
Start 1804
6/12 2052 248 18.94 13.1
6/13 2339 287 11.586 [not full, combined]
6/15 2445 106 14.474 15.1
6/15 2622 177 12.399 14.3
6/19 2827 205 13.264 15.5
6/19 2973 146 10.061 14.5
6/21 3195 222 15.068 14.7
6/22 3339 144 10.451 13.8
6/24 3534 195 13.424 14.5
6/25 3706 172 11.931 14.4
6/27 3879 173 11.875 14.6
6/28 4079 200 12.943 15.5
TOTAL 2275 156.416 14.5

In case that doesn't format too well, a screen shot is attached. The MBS performed admirably and is a real trooper on hills both up and down! The MPG data include flat areas, mountain climbing, strong head and side winds and both hot and cold weather. The lack of variability is surprising. The lower first day may be due to starting with city driving. We ended with city rush hour driving too, but haven't refueled yet so that does not show here.
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Old 06-29-2016, 07:09 PM   #85
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Quote:
Originally Posted by Beachsailor View Post
Has anyone compared the Trekker cab verse the sleeper cab for difference in drag?
We have a 2017 MBS 2400WS with the trekker cap. Only have about 1100 miles on it so far but we averaged just over 13 mpg on an 800 mile trip to the UPPER and back, Most of the mileage was on I-75 running 65 to 70. We are real happy about the mileage because that was while pulling our loaded enclosed motorcycle transport trailer which weighs in at 3000 pounds loaded.

We are heading north again on Friday, My step-sister invited us up to her place in Cross Village. Hope its a nice weekend because we plan on riding the "Tunnel of Trees'. I will report back on the mileage for this trip when we get back.
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Old 06-29-2016, 07:11 PM   #86
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Thanks for the info. What was your usual cruising speed on the interstate?

I'm getting 1 mpg less at around 13.5 at 65 mph. Here's some extreme data. Speed limit across west Texas is 80 which gave me 9.8 mpg. So as a test I slowed down to 55 for the next tank and got 15.0. I think the wind resistance at the higher speeds is a mileage killer.....
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Old 06-29-2016, 07:16 PM   #87
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Originally Posted by bob5560g View Post
Thanks for the info. What was your usual cruising speed on the interstate?

I'm getting 1 mpg less at around 13.5 at 65 mph. Here's some extreme data. Speed limit across west Texas is 80 which gave me 9.8 mpg. So as a test I slowed down to 55 for the next tank and got 15.0. I think the wind resistance at the higher speeds is a mileage killer.....
If that question was directed to me, we were usually traveling at 55, probably averaging more like 50 overall. Lots of construction starts and stops. Very rarely did we get up to 65 and the wind resistance is quite significant. The max. speed across Canada is 100 kmh which is roughly 60 mph. But they have you stop for construction every 10 miles or so! LOL
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Old 06-29-2016, 11:26 PM   #88
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Originally Posted by bob5560g View Post
Thanks for the info. What was your usual cruising speed on the interstate?

I'm getting 1 mpg less at around 13.5 at 65 mph. Here's some extreme data. Speed limit across west Texas is 80 which gave me 9.8 mpg. So as a test I slowed down to 55 for the next tank and got 15.0. I think the wind resistance at the higher speeds is a mileage killer.....
My step-brother is an engineer working R&D for GMC. We got to talking about the 3 liter V6 Turbocharged diesel engine along with the 5 speed auto that Mercedes-Benz uses on their Sprinter 3500 chassis.

Diesel engines are designed to provide the best pulling power along with fuel economy when within the maximum Torque range. That combination is between 1400 and 2400 rpm. At 2400 RPM which is at the top of the torque range our Sunseeker cruises at a cool 60 MPH.

As the rpm's go up that torque goes down BUT the Horsepower increases. It takes calories (fuel) to produce Horsepower. At 70 mph we are turning 2800 RPM which would obviously burn more fuel, running 80 mph would use even more.

Obviously you would be loading down the engine if you try to run in fifth gear at 1400 rpm so you would want to be in the 2000 to 2400 rpm range when running in fifth gear which would equate to optimum fuel economy running down a level, at sea level road, with no head wind in the 50-60 mph range.

Basically if you are into pinching pennies and don't mind being run over by semis, then running 50 down the expressway would be the thing to do. Here in Michigan the truck speed on the interstate is 60 mph and most run 65. I choose to run with them and not worry about the gallon or two a mile I may lose instead of being run over by them.
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Old 06-30-2016, 12:44 AM   #89
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Forester MBS Fuel Consumption

The engine works remarkably well and the cruise control does a commendable job keeping it purring in the 2000-2400 range for the most part. If it lags, you can kick it down with the gas pedal or manually downshift and it stays in cruise control. Rarely did it have to climb to 3000 either up or down hill but in occasion it did. Clearly it loves to cruise on level to downhill at 50-55 and barely sips fuel at that speed with no incline.

The cruise control is amazing and will be the subject of a future post all of its own!


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Old 07-06-2016, 12:06 PM   #90
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First MPG check

We just filled up for the first time since leaving campground near dealer. Filled up on way home, took 2 short weekend trips and did some driving around town (to acclimate cat to MH). 2401R w/trekker cap - 240 miles, no wind, no toad, flat roads, mostly 60 mph = 15.5 mpg. Hopefully it will improve slightly with break-in and longer trips because I'm getting my car set up for toad duty soon and will head for the mountains, which will surely bring it down some.
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