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Old 04-10-2011, 07:51 AM   #15
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We drive on average 60 mph, not for gas mpg but for comfort of safety. 6.5, 7, 8.5 or 9 mean nothing in real cost to comfort and safety of pushing 11 tons. down the road to us.
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Old 07-07-2011, 09:26 PM   #16
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Just did a 300 mile trip, combined mountain, freeway and side roads. Got 7.75 mpg. Driving it like I stole it.

Mark
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Old 07-07-2011, 09:41 PM   #17
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Quote:
Originally Posted by Campingman View Post
Just did a 300 mile trip, combined mountain, freeway and side roads. Got 7.75 mpg. Driving it like I stole it.

Mark
According to a published Cummins white paper it takes 144,000 miles to get an accurate overall mileage.

Of course YMMV!!
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Old 07-07-2011, 11:41 PM   #18
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We get about 7.5 mpg with our signature rig. It's a lot better than our old 85 Class C with a carb-equipped 460, which got about 7 at sea-level and about 5 in the mountains. Computer-managed engines are a great development.

We can live with that for the pleasure we get out of it.
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Old 07-08-2011, 06:53 PM   #19
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We tow a 6,000lb brick behind our Cummins / Aisin (toyota) drivetrain. The coach weighs 19,500 full. The Wagon weighs 6,000 empty. Almost 3k miles now and I have averaged 8.77mpg. I keep the skinny pedal at 65mph constant.

Love our drivetrain.
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Old 07-09-2011, 06:07 AM   #20
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If you want mileage and at today's prices, who doesn't. Keep that speed down, anything above 60 will eat your lunch. There is tons of data available on this phenomena referred to as "wind load". It exponentially increases forward motion resistance on a multiplying basis. If you calculate 5 mph higher speed with the time you will arrive at any destination, it simply doesn't make sense to drive faster. Slow down, enjoy the ride, and save a ton of $$$$. just sayin
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Old 07-10-2011, 08:21 PM   #21
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At 55 MPH I get a good 8.5 from my ford V10 34 foot MH. pulling a toyota PU
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Old 07-11-2011, 07:26 AM   #22
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We just returned from a 2K trip and with our 32' Coachmen Class C got from the low to mid 7's pulling a Toyota 4Runner driving 65 to 70 MPH. I suspect that would go up by 1 mpg if I backed of to 58 to 60. I need to sit down and calculate the delta on both sides between cost/time but thinking about it off the top of my head the cost side will probably loose. The rig is certainly easier to drive at 60 vs 70 so stress comes in to play as well.

Slowing down is tough but probably smart human nature is we don't like to be passed!!!
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Old 07-18-2011, 06:05 PM   #23
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have a 31 2007 with 22,000 on it E 450 v10
I get 7.8 - 9 a the lowest 7.8 was in the smokie mountains with the ac on at 70mph
with a full load.


we use use syn oil and k&N air filter
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Old 07-18-2011, 06:14 PM   #24
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Usually get between 7 and 8 with our V-10. Try to go the speed limit or a few over.
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Old 07-18-2011, 06:29 PM   #25
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have a 31 2007 with 22,000 on it E 450 v10
I get 7.8 - 9 a the lowest 7.8 was in the smokie mountains with the ac on at 70mph
with a full load.


we use use syn oil and k&N air filter
Seems to be about what these 30' plus Class C's get. I can live with that.

Thanks
Mark
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Old 07-19-2011, 08:41 PM   #26
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If you want mileage and at today's prices, who doesn't. Keep that speed down, anything above 60 will eat your lunch. There is tons of data available on this phenomena referred to as "wind load". It exponentially increases forward motion resistance on a multiplying basis. If you calculate 5 mph higher speed with the time you will arrive at any destination, it simply doesn't make sense to drive faster. Slow down, enjoy the ride, and save a ton of $$$$. just sayin
I found this with a simple Google search

Speed and Slowing Down

The next greatest improvement in fuel economy is the speed we drive. Driving faster pushes more air ahead of the RV, which creates more resistance to forward movement. Without getting into hard core physics lesson, increasing speed from 55mph to 75mph, or 90 km/hr to 120 km/hr, increased speed by 35% but increases wind load by 250%. Your RV has to work exponentially harder with every increase in speed above 55 mph/90 kmh. The average decline in gas usage from 55 - 75MPG is 40% - 50%. If you're getting 10 MPG at 55mph/90kph, then you will be getting 5.5-6 MPG at 75mph/120kph. Let's put that into monetary values. At a price of $3.00 per gallon, it costs $30 to drive 100 miles at 55 mph. If you drive faster at 75 mph, you’ll pay $54.50 to drive the same distance, almost an 80% increase. Slowing down saves a LOT of money.

Now at $3.70 a gallon the savings are even more. I guess we need to consider how much our time is worth not to mention safety and the stress of driving a Class C at higher speeds...

I just don't like to drive that slow this is going to take some self discipline.


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Old 07-20-2011, 07:36 AM   #27
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I certainly also had to learn the hard way. I was a buster astor on the highway until I started noticing rigs I had passed way back on the road were coming into the same camp ground just a few minutes after I got registered and parked. The speed, the hassle, and excess use of fuel just did not compute.
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Old 07-20-2011, 11:01 AM   #28
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The worst thing they (government) ever did was rase the speed limit from 55 MPH; Wait for it; wait for it; the diesel folks are about to post that they get better milage when they go faster.
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