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Old 06-28-2019, 06:32 AM   #1
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Monaco Owners Club
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Location: Elizabethtown, Ontario
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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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Old 06-28-2019, 06:36 AM   #2
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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.

1998 Southwind Storm 34S
2015 Ford Focus Hatchback SE
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Old 06-28-2019, 06:39 AM   #3
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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!
2005 Newmar Mountain Aire
Minnesota / 82 & Sunshine
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Old 06-28-2019, 06:42 AM   #4
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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..
1999 Fleetwood Southwind 35S (Ford F53 6.8L V10 275hp 4R100 4 spd trans) - Toad 2003 Saturn Vue.

It won't do MACH 2, but I can get a sandwich and take a pee.
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Old 06-28-2019, 06:43 AM   #5
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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
2005 Jeep Grand Cherokee w/5.7 Hemi
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Old 06-28-2019, 06:44 AM   #6
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I usually drive between 62-65 I'm getting in the high 9's
1998 36ft Country Coach Magna #5499
Gillig chassis with a Detroit series 40
2015 Wranagler JKU towed
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Old 06-28-2019, 07:13 AM   #7
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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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Old 06-28-2019, 07:20 AM   #8
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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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Old 06-28-2019, 07:37 AM   #9
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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.
1974 GMC 4108 - Custom Coach Conversion
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Old 06-28-2019, 07:52 AM   #10
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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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Old 06-28-2019, 08:07 AM   #11
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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.
2018 Chevy DRW
2008 Carriage Cameo, F34CK3
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Old 06-28-2019, 08:23 AM   #12
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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
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 Jeep JKU
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Old 06-28-2019, 08:28 AM   #13
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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
Newmar Dutch Star 4320, Spartan MM Chassis, Cat C9, 2018 Jeep Wrangler Unlimited, Blue Ox Aventa LX, and AF1. TST 507 TPMS
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Old 06-28-2019, 08:41 AM   #14
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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.RVM#189
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