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Old 07-04-2015, 02:53 PM   #11
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Towing a Honda CRV we average about 11.5 GPM. This includes a lot of mountain driving. I drive the speed limit to a maximum of 65 MPH and use the cruise control as much as possible.
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Old 07-04-2015, 05:23 PM   #12
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fuel

That is a lot of fuel, 11.5 gals per mile.,wow
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Old 07-04-2015, 06:13 PM   #13
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Really nice all you folks have taken the time to write. It helps a lot, and it is much appreciated!
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Old 07-04-2015, 06:35 PM   #14
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We tow a Suzuki Samarai. On last trip through Eastern Sierras averaged 13mpg for the trip. We use cruise control as much as possible and set it at 2500 rpm which is about 62 - 64 mph. The tank we used driving through the desert with strong headwinds, the mpg was 11.5.
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Old 07-04-2015, 09:27 PM   #15
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Yeah, northdokata, but a lot better than the 7.4 mpg average I got in my big diesel pusher! Hey, add to the conversation here. What do you get? What speeds. Towing or not? Mountains, level ground? This is an interesting link.

On a recent 1,000 mile trip I got as much as 14 mpg towing on level ground and below 11 mpg on about 200 miles of up and down mountain driving from elevations of 400 feet to over 5,000.
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Old 07-05-2015, 07:37 AM   #16
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I set the cruise at 60. We average 16. I actually got better mpg in the mountains. Just returned from 8000 mile 8 week trip out west. Slow down and watch how much weight you carry.
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Old 07-05-2015, 11:05 AM   #17
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I've towed trailers with a '99 Dodge Cummins, which is 5.9 liter and produces about the same torque and HP as the Benz 3.0 liter in my '15 Solera. My last trailer + truck weighed in around 12,000 lbs total. Pretty close to the Solera loaded with our stuff. Strange but true, the truck averaged around 14.5 as does the Solera! I operated both RVs around 60 mph on cruise.

The best mileage scored by the Solera was 16.5 mpg which was on the flat but at low speed due to traffic - 40 to 45 mph. The best with the truck / trailer combo was almost 17 mpg - on the flat DRAFTING, about 100 feet behind semis on the interstate for about 150 miles.

I now have a Smart Car dinghy which weights in at 1,700 lbs. After several hundred miles, the Solera is getting 13.5 mpg towing the Smartie, as before, around 60 mph.

These numbers have led me to the following conclusions:

1. Wind resistance / drag significantly affects mileage. If you have the time to tinker a bit, driving closer to 55 or even 50 mph should get you smiling at the next fuel stop.

2. Weight and the energy needed to move it is pretty much a constant. Big engine, little engine, turbo charged engine; given our state of the art diesel technology will use the same amount of fuel to move the RV.

3. Minimizing RPMs while maintaining safe speeds gets me the best economy; On the Dodge Cummins, 1,600 RPM. On the Solera, 2,000 RPM.

One of the items I sorely miss on the Solera is the Exhaust Gas Temperature gauge (pyrometer). This is the best way to measure how hard the engine is working. Lower temperatures mean better economy.

Hope these insights are helpful
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Old 07-05-2015, 11:28 AM   #18
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Quote:
Originally Posted by lacamastraveler View Post
Yeah, northdokata, but a lot better than the 7.4 mpg average I got in my big diesel pusher! Hey, add to the conversation here. What do you get? What speeds. Towing or not? Mountains, level ground? This is an interesting link.
X2
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Old 07-05-2015, 07:38 PM   #19
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over on the sprinter-source forum there are quite a few good pointers (search for a guy whose nickname is Sailquik - his real name is Roger for especially good driving techniques) on driving the 5-speed to improve economy and also keep the emissions components cleaner. most of these tips suggest installing a ScanGauge II or something similar to watch the load on the engine, and downshifting manually to keep the load below certain levels, etc. Dramatically better economy is often reported when these tips are followed. You may already know of these tips and be following them, and if so, I apologize in advance for reviewing them here!
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Old 07-05-2015, 11:28 PM   #20
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I attached a scan gauge to monitor engine temp. It also shows fuel economy. Doesn't help much since I tend to be an old man driver. Also shows how much boost which equates to mileage



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