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06-28-2019, 06:32 AM
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#1
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Senior Member
Monaco Owners Club
Join Date: Jul 2018
Location: Elizabethtown, Ontario
Posts: 225
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Cruising Speed
Being new in the RV world I have numerous questions and here is my latest.
At what speed do you people usually cruise on an interstate highway?
I travel at about 60mph because the previous owner said that was the best speed for fuel economy and he would average 12 MPG on a trip.
On my last trip of just under 500 miles, I tried to cruise at 60mph and at the end I got 8.2 MPG. Now mind you that was through the hills in the Finger Lakes, but still getting almost half of what he did.
Unfortunately, I can't ask him any questions because he passed away just after selling me the rig.
So I will be very appreciative of all what you have to say on this subject.
Thank you
__________________
40 foot 2002 Monaco Diplomat
2005 Ford Focus to tow around
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06-28-2019, 06:36 AM
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#2
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Senior Member
Join Date: Jul 2015
Posts: 1,881
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Average 12 MPG? I don't think he was completely honest about that.
60-65 MPH and average 7.5 MPG in my 34" gasser.
__________________
2010 Phaeton 40QTH on a PG Chassis.
2017 Lincoln MKX.
Air Force One brake system and Blue OX Towbar.
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06-28-2019, 06:39 AM
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#3
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Senior Member
Join Date: Sep 2015
Posts: 193
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For What it's worth -
I have a 42' diesel pusher with 400HP Cummins...
My mileage is probably 6.5 to 8.5 MPG 85% of the time at 62 MPH.
Good Luck with your new rig!
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FlatsixV2
2018 Fleetwood Pace Arrow
82 & Sunshine
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06-28-2019, 06:42 AM
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#4
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Registered User
Ford Super Duty Owner
Join Date: Nov 2014
Location: NW Ohio
Posts: 7,114
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I have an older Ford F53 with V10. I average 7.0 mpg, running 62-65 mph with gross weight of 23,000 lbs fully loaded dragging a toad..
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06-28-2019, 06:43 AM
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#5
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 14,603
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12 mpg ??? I think PO was delusional.
I pretty much set the cruise at the speed limit. Depending on traffic I my be slightly higher or lower as I try to go with the general speed.
I get ~8 mpg pulling a Jeep. I've tested going slower or faster and it doesn't make a lot of difference.
FYI, if you get a Silverleaf VMSpc you'll get a very accurate reading of fuel mileage and be able to see consumption based on speed.
__________________
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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06-28-2019, 06:44 AM
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#6
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Registered User
Join Date: May 2005
Location: Milford,CT.
Posts: 2,237
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I usually drive between 62-65 I'm getting in the high 9's
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06-28-2019, 07:13 AM
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#7
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Senior Member
Join Date: Oct 2002
Location: Madison, MS
Posts: 10,527
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Imo, “most” class A MH get between 6 & 8 MPG. You should accept the PO’s claim as marketing hype. It ain’t gonna happen.
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06-28-2019, 07:20 AM
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#8
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Senior Member
Join Date: May 2017
Location: Metamora, MI
Posts: 5,525
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Use Search. Both cruising speed and MPG and both discussed together have been exhausted about a zillion times on this forum.
If you are calculating your mileage correctly, you are getting better than most. But you are also driving slower than most.
__________________
2002 Newmar Mountain Aire Limited 4370 w/ Spartan K2 and Cummins 500hp
ASE Master Certified (a long.....time ago...)
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06-28-2019, 07:37 AM
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#9
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Senior Member
Join Date: May 2019
Posts: 2,392
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Tires on your coach most likely have a speed rating of 75mph. That doesn't mean that the tire manufacturer intended for you to cruise at 75, but rather that they'd be safe to do so for a specific length of time. I believe that it is a ten-minute standard.
I always try to leave considerable head room on any system capacity or rating like that. My cruise speed is between 60-65,usually right around 62mph.
Speed limits are often higher, sometimes lots higher. Sometimes in excess of the tire speed rating. Don't let speed limit for the road get confused with safe speed for your coach.
__________________
Richard
1994 Excella 25-ft (Gertie)
1999 Suburban LS 2500 w/7.4L V8
1974 GMC 4108a - Custom Coach Land Cruiser
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06-28-2019, 07:52 AM
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#10
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Senior Member
Join Date: Aug 2018
Location: Wa state
Posts: 218
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Heh, heh, 12 mpg. Your doing pretty good at 8.2. Our 33’ gasser gives us 6-7 at 60-65 cruising speed. I don’t go go much faster than that unless I need to temporarily if the situation dictates it.
__________________
2007 National RV, Sea Breeze 1321, Ford F53,
Followed by a 2013 Wrangler JK Moab edition
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06-28-2019, 08:07 AM
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#11
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Registered User
Join Date: Oct 2017
Posts: 4,985
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Mileage can vary by 20% depending on the driver habits. Last week my Chevy DRW got 14.3 mpg on I-80 in NE pulling a gross wt of 25k. Now this is with cruise set at 60, very little wind, flat road, and not touching the brakes for 300 miles (probably the best condition to have). Usually I get around 9/10 mpg off the X-way.
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06-28-2019, 08:23 AM
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#12
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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My 45', 52,000# 650 hp mh gets 7.7 mpg over the last 56,000 miles towing a CR-V.
My previous 32,000# MH with 350 HP ISC and Banks kit (432hp) got under 8 towing a Honda Ody.
I cruise at about 62 using the cruise control.
__________________
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
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06-28-2019, 08:28 AM
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#13
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Community Moderator
Newmar Owners Club
Join Date: Feb 2011
Location: Point Pleasant Beach, NJ
Posts: 31,553
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If you were to search all the threads regarding MPG you would find that almost everyone is getting 6.5-8.5 mpg. I think perhaps the previous owner may have fudged his estimates or he was bad in math.
__________________
Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS
No amount of money can buy you an extra second of time.
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06-28-2019, 08:41 AM
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#14
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Senior Member
National RV Owners Club Freightliner Owners Club
Join Date: Jul 2015
Location: Conch Republic
Posts: 2,535
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Cruising speed in our old 30' gasser was 65-70 unless we wanted to talk then I brought it down to 60. At 55 we got 10mpg at 65 around 8mpg. Light weight, no slides short length.
__________________
33' 2008 National Tropical on a Freightliner chassis.We tow a 2001 XJ (Cherokee) RVM#189
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