|
09-23-2021, 11:17 AM
|
#1
|
Senior Member
Join Date: Aug 2020
Location: Ft. Myers, Fl.
Posts: 897
|
Fuel mileage question
Not really a huge concern but are Super C's better on fuel than a class A? 8.9l cummins
|
|
|
|
Join the #1 RV Forum Today - It's Totally Free!
iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!
You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!
|
09-23-2021, 12:08 PM
|
#2
|
Senior Member
Join Date: Jan 2018
Location: Capistrano Beach, California
Posts: 4,465
|
Quote:
Originally Posted by outlawten5
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.
__________________
Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
|
|
|
09-23-2021, 12:24 PM
|
#3
|
Senior Member
Join Date: Aug 2020
Location: Ft. Myers, Fl.
Posts: 897
|
Good points. Just curious. Still weighing the pro's and cons of each. Ugh! Too many variables.
|
|
|
09-23-2021, 03:25 PM
|
#4
|
Senior Member
Join Date: Mar 2021
Posts: 235
|
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.
|
|
|
09-23-2021, 05:10 PM
|
#5
|
Senior Member
Join Date: Aug 2020
Location: Ft. Myers, Fl.
Posts: 897
|
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
|
|
|
09-23-2021, 05:14 PM
|
#6
|
Senior Member
Join Date: Aug 2020
Posts: 174
|
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!
__________________
2014 Renegade Classic, 45', Freightliner Cascadia 126
Cummins ISX15 with 13 speed Eaton auto shift
2023 Jeep Wrangler Eco-diesel toad
|
|
|
09-23-2021, 08:09 PM
|
#7
|
Senior Member
Join Date: May 2021
Location: S.E. Tennessee
Posts: 208
|
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.
__________________
Mark & Kristi
2022 Newmar King Aire
2021 Jeep Wrangler Rubicon
|
|
|
09-23-2021, 08:19 PM
|
#8
|
Senior Member
Join Date: Mar 2019
Location: Lansing MI
Posts: 2,821
|
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."
__________________
An Old Fisherman
2017 Nexus Ghost 36DS, 2014 Ford F150 Long Bed
2007 Harley-Davidson Ultra Classic
|
|
|
09-23-2021, 08:27 PM
|
#9
|
Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
|
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.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
|
|
|
09-24-2021, 07:54 AM
|
#10
|
Member
Join Date: Nov 2020
Location: Charleston, SC
Posts: 62
|
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.
|
|
|
09-27-2021, 06:01 AM
|
#11
|
Member
Join Date: Dec 2014
Location: South Florida
Posts: 66
|
Quote:
Originally Posted by Mark3101
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.
__________________
2021 Renegade XL 45BBC
2020 Bravo Icon Stacker 28'
2021 Jeep Rubicon Eco Diesel
|
|
|
09-28-2021, 09:01 PM
|
#12
|
Member
Join Date: Apr 2016
Posts: 95
|
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.
|
|
|
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
|