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Old 07-13-2016, 02:04 AM   #11
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mpg

I've had my 2012 about 3 years now -- just tripped 36K on the odometer on my last outing. My fuel mileage had varied from under 9.8 to 15.6 mpg MAX.

I've filled up once and climbed to 8000 feet on a tank and gotten 14. I've filled up and driven the flat, windless San Joaquin Valley floor (at 75mph and 3K RPM) on a tank and got 10.2.

My best mileage EVER was over a couple of days of stop and go driving in Yellowstone's varied terrain -- driving it like a "bread truck" -- rarely over 40 mph and got the 15.6!

It's funny, the 2nd best mpg I EVER got was when I was towing my 55 Willys and was "legally" forced to keep my speed under 60. My fuel mileage was just under 15 with a vehicle in tow!! (Maybe I show tow more often!)

Wind is a factor, without a doubt, by I've determined like all diesels, if I keep the RPM's down and consistent -- that's when I max my mpg.
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Old 07-13-2016, 09:21 AM   #12
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I've found the same thing. Keeping your speed down gives a lot better mpg. I usually drive 55-60 and most always towing, averaging 14.5 mpg. Once I did a stretch at 65 and saw the mpg go dramatically down. I'm guessing that the big house on top of the chassis creates a LOT of wind resistance.
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Old 07-13-2016, 11:06 AM   #13
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I just had my 2014 24R into Mercedes for 2 recal fixes both in the electronics and asked them about the MPG. They said air pressure in all the tires will be critical to getting the best MPG (firmer is better) but max PSI is 80. They said that the 2 recall fixes "might" improve the MPG a bit. They also said that the FP models get more wind resistance than say the Thor because of the larger over head bed. By the way I was quite impressed with the dealership. They did a full inspection and checked all tire air pressure AND washed the entire exterior and vacuumed the interior. We had just returned from a trip so the exterior needed a good cleaning.
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Old 07-23-2016, 03:35 AM   #14
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I've been thinking about using the Mercedes service facility in Rocklin. Is that the one you used?
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Old 07-23-2016, 09:18 AM   #15
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I have used the Rocklin Mercedes dealer twice now and both times received excellent service.
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Old 07-24-2016, 02:05 PM   #16
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Good to hear that. I'll go there for my first first service. Thanks
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Old 07-24-2016, 07:04 PM   #17
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Originally Posted by namusmc View Post
I've been thinking about using the Mercedes service facility in Rocklin. Is that the one you used?
Yes I used the Rocklin MB dealer and was very happy. I had to have my Solera smogged because I bought it out of CA and they were very expensive to have the smog done ($89 vs $52 at a local smog place) but for the work I had them do I was quite happy and they have a free shuttle to take you home and pick you up within 20 miles of the dealership. And a free check of tire pressure etc and free wash of the motorhome.
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Old 07-26-2016, 02:48 AM   #18
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Good to know. Thanks
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Old 07-26-2016, 06:29 AM   #19
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Originally Posted by KatanaPilot View Post
Similar RV pulling the same Toad and about the same mileage. I'm not unhappy about it at all. It's a 11,000 pound vehicle with the aerodynamics of a barn door (perpendicular to the wind) pulling a 2500 pound car. Anyone expecting 16-20 mpg with these things is overly optimistic.
X2

My step-brother is an engineer in the R&D department for GMC and works at the Milford proving grounds most of the time. With diesels, research has shown that you will get your best fuel mileage by keeping the engine RPM's within the engines "Torque" range. If your RPM's are below the torque range the engine will struggle and you will waste fuel., if the engine RPM's is above the torque range, you will be producing horsepower instead of torque and horsepower requires energy, i.e. FUEL

The torque range for the V-6 24 valve Turbocharged clean diesel engine is 1400 RPM - 2400 RPM. Cruising in fifth gear with the engine turning 2400 RPM equates to 60 MPH on a flat road with no headwind. Anything faster that 60 MPH equates to getting less fuel mileage.
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Old 08-01-2016, 12:30 AM   #20
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Thanks for all the info. Can't wait to get back on the road. Headed for Southern Utah and National Parks in September.
Any tips?
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