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Old 09-23-2021, 11:17 AM   #1
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Fuel mileage question

Not really a huge concern but are Super C's better on fuel than a class A? 8.9l cummins
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Old 09-23-2021, 12:08 PM   #2
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Quote:
Originally Posted by outlawten5 View Post
Not really a huge concern but are Super C's better on fuel than a class A? 8.9l cummins
If you mean, same engine in a class A vs a Super C, then the answer is a definite, "maybe." Weight differences will be a key, but the aerodynamics of a class A vs a Super C may play a small part, not to mention driver technique. You would need to compare the two vehicles of nearly identical weights to eliminate that variable, and see which gets better mpg based solely on physical profile.

Further, if the DP has a side radiator, that will draw horsepower from the engine causing a need to increase power to "drive" at the same speed as a front engine Super C.

I think you began your question with the correct perspective, "not really a huge concern."


Common sense says the C will get better mph, but to what degree is questionable.
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Old 09-23-2021, 12:24 PM   #3
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Good points. Just curious. Still weighing the pro's and cons of each. Ugh! Too many variables.
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Old 09-23-2021, 03:25 PM   #4
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I agree that it isn’t material consideration.

We have a Super C with a Cummins ISX-15/600. 7mpg

In a best case scenario if a super C got 1mpg better than a class A, and assuming you drove 10,000 miles. That would be a difference of 230 gallons every 10k miles. At current prices that is $750.

After the cost of purchasing the coach, insurance, depreciation, maintenance, camp fees, what is $750 for 10k miles?

Don’t think it is a significant factor in the decision process.
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Old 09-23-2021, 05:10 PM   #5
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As I mentioned, not a deciding factor. Just a bonus. Although as mem pointed out, a very small one. I'm not even concerned about storage space as I'll be towing an enclosed car trailer. Thanks guys
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Old 09-23-2021, 05:14 PM   #6
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Not the first question I would ask when considering the purchase of an RV, especially on the Renegade site. There are plenty of blogs debating the differences between a DP and a Super C. Like ride, safety, usable floor plans, serviceability, but rarely fuel mileage. Like the others have said, at 10,000 miles a year, (more than most rvers drive) its a relatively small percentage of your total costs. But since you asked, my 45 footer with an ISX15 and 13 speed Eaton gets between 6.5 and 7.5 depending on conditions and towing a Jeep Wrangler and I drive it like I stole it!
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Old 09-23-2021, 08:09 PM   #7
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My new Ikon gets between 7.5 and 8.0 mpg pulling a Jeep Wrangler Unlimited. In comparison, my 3 Prevost conversions averaged about 5.5 to 5.7 mpg pulling the same type of toad. I have put 10,000 miles on the Ikon since we picked it up the end of July and will put at least another 5,000 on it in the next month or so.
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Old 09-23-2021, 08:19 PM   #8
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Since the biggest factor in fuel mileage is the frontal area of the rig I don't think there will be a material difference. As far as streamlining goes one big factor that is commonly overlooked is the rear of the vehicle and all RVs are flat in the back which is the worst of all possible designs. Keep your tires inflated to the proper pressure and keep your speed to 65 mph and you will get about the best mileage you're going to get without being a rolling speed bump. As I heard one time "All those in favor of getting better fuel mileage raise your right foot."
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Old 09-23-2021, 08:27 PM   #9
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Cummins fleet testing shows a 20% difference in fuel mileage between the best and worst drivers. At 7 mpg that's 1.4 mpg just from the driver alone.
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Old 09-24-2021, 07:54 AM   #10
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Another data point-our 39 Classic (roughly 40k lbs) with DD16/DT12 combo got 7.3 mpg on a recent 3000 mile trip. Cruise set at 70 mph on the interstate towing a 2 door Wrangler.

We got 8.1 mpg on a more recent 2000 mile trip towing a 24 box trailer. Trailer was empty one direction and carrying about 3k lbs the other half. Cruise set at 65 mph on this trip.

I think speed has more to do than most anything with any larger rig.
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Old 09-27-2021, 06:01 AM   #11
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Originally Posted by Mark3101 View Post
My new Ikon gets between 7.5 and 8.0 mpg pulling a Jeep Wrangler Unlimited. In comparison, my 3 Prevost conversions averaged about 5.5 to 5.7 mpg pulling the same type of toad. I have put 10,000 miles on the Ikon since we picked it up the end of July and will put at least another 5,000 on it in the next month or so.

My XL is similar. I noticed speed is a major factor. If I run 55-60 without a toad I can get as much as 10mpg. Running 73 drops it dramatically. Pulling my 28' stacker at 73 brings me down to about 6mpg.
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Old 09-28-2021, 09:01 PM   #12
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Air resistance is a function, among other things, of the square of your velocity, I believe. Small increases in speed have a large effect on resistance, and therefor the fuel usage to combat that resistance.
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