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05-20-2021, 07:48 AM
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#43
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Senior Member
Join Date: Jun 2018
Location: Yavapai
Posts: 574
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Raises the question of the rated maximum tire speeds.
__________________
2007 Alpine SE 34FDDS + Cherokee Trailhawk
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05-20-2021, 02:54 PM
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#44
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Junior Member
American Coach Owners Club
Join Date: Dec 2020
Posts: 14
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We are averaging around 9 with a 350ISC towing CRV and keeping it around 60ish mph.
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05-20-2021, 03:21 PM
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#45
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Member
Join Date: Dec 2015
Posts: 38
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I have 37' with a Cat 3126b and at 65mph and no toad I get right at 10mpg. Econo mode 90% of the time. Towing I get 8.5 to 9. Speed is a huge MPG killer. I did a speed run back and forth to Lake Havasu at 75+ with no toad and my MPG dropped to 7.5! Yikes... 
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05-20-2021, 03:27 PM
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#46
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Senior Member
Join Date: Jan 2018
Location: UT
Posts: 1,257
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65mph towing about 10mpg for me. Higher speed lower mileage for me. Also, hugely dependent upon wind speed and direction.
__________________
Ed
2023 Geneva 28VA
2018 Thor Palazzo 33.3
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05-20-2021, 03:43 PM
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#47
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Junior Member
Join Date: Jan 2021
Posts: 10
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Remember the journey
Look up Scott Kirby song
Port out Starboard home it tells the hole story
Enjoy life is short
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05-20-2021, 04:06 PM
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#48
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Member
National RV Owners Club
Join Date: Jan 2016
Location: Canon City Co
Posts: 72
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2017 Airstream Interstate 24’ extended, highway 20 mpg, town 15-16 mpg, average in the 17-18 ish. The van is a Mercedes Benz 3500 Diesel Sprinter. I ditched the class A, it was a 38’ Cummins, and got 6-9 mpg pulling a tow...
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05-20-2021, 04:23 PM
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#49
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Senior Member
Join Date: Oct 2014
Posts: 7,881
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Quote:
Originally Posted by Blazeman
2017 Airstream Interstate 24’ extended, highway 20 mpg, town 15-16 mpg, average in the 17-18 ish. The van is a Mercedes Benz 3500 Diesel Sprinter. I ditched the class A, it was a 38’ Cummins, and got 6-9 mpg pulling a tow...
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We seem to be straying a LONG WAYS from the OP's question of MPG for a 38' DP with 400 HP Cummins ISL.
Can a much smaller vehicle with a much smaller engine get better MPG. YUP-- no big surprise.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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05-20-2021, 04:23 PM
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#50
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Junior Member
Join Date: Oct 2020
Posts: 2
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Have a Cummings 450 in a 45’ tag and toad, also get 8.2. Think you are ok.
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05-20-2021, 04:31 PM
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#51
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Member
National RV Owners Club
Join Date: Jan 2016
Location: Canon City Co
Posts: 72
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Quote:
Originally Posted by wolfe10
We seem to be straying a LONG WAYS from the OP's question of MPG for a 38' DP with 400 HP Cummins ISL.
Can a much smaller vehicle with a much smaller engine get better MPG. YUP-- no big surprise.
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As was stated my 38’Class A got a whopping 6-9 mpg. Just had to rub- in the MERCEDES BENZ Airstream Interstate’s combined 17-18 mpg. Sorry to have offended you...
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05-20-2021, 05:04 PM
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#52
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Senior Member
Monaco Owners Club
Join Date: Oct 2018
Location: Mulino, OR
Posts: 485
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Here we go again! Tell me this, if you don’t get the mileage you were looking for, will you not travel anywhere? The bottom line is, when you get low on fuel, you pull over and get more.
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05-20-2021, 05:08 PM
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#53
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Senior Member
Join Date: Oct 2014
Posts: 7,881
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Quote:
Originally Posted by Blazeman
As was stated my 38’Class A got a whopping 6-9 mpg. Just had to rub- in the MERCEDES BENZ Airstream Interstate’s combined 17-18 mpg. Sorry to have offended you...
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Not offended at all. Just totally irreverent.
BTW have had RV's from VW P27 campers that got in the mid 20's to 38'/400 HP diesel pushers that get around 9. And understood the tradeoffs before stepping in.
Most us KNOW a how physics works and understand the tradeoffs.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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05-20-2021, 05:34 PM
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#54
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Senior Member
Join Date: Jan 2021
Posts: 108
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MPG:sad:
I have a 2006 Monaco Knight. Over a 2500 mile trip, I averaged 7.35. I was unhappy. With previous motorhomes, I averaged high 8s.
That calculation was by yellow #2 and not blue fire.
Mike
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05-20-2021, 05:38 PM
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#55
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Member
Join Date: Jul 2015
Location: Cloverdale Ca.
Posts: 33
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Anything over 8 is a dream if you are toeing and in the mountains on the west coast.
I averaged 7.75 Ca. to Co. but I drive 70 MPH and tow a CRV. Get real close to 8 if I stay out of the mountains.
Wayne
__________________
Wayne
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05-20-2021, 05:52 PM
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#56
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Senior Member
Join Date: Apr 2021
Location: Reche Canyon, CA
Posts: 384
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Quote:
Originally Posted by Ken Thompson
Here we go again! Tell me this, if you don’t get the mileage you were looking for, will you not travel anywhere? The bottom line is, when you get low on fuel, you pull over and get more.
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Not sure if this is directed at me but my reasoning was to see if I was in the ballpark to like /kind vehicles gives me an idea if the vehicle is running correctly. When my tank goes empty I fill it up, I dont price shop I just stop when the needle tells me to
__________________
Bruce and Doreen
2002 Alpine 38 FDDS 400 / 2006 Jeep Commander Hemi and Smart car toads 600 amp hours / 1200 watts solar
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