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Old 07-22-2018, 09:28 PM   #15
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fuel Miliage

As a rule of thumb, if youíre moving about 100-105 Lbs/hp youíll probably get about 8 mpg. Of course, it will vary somewhat with speed, terrain, and whether youíre a smooth driver or a rough-footed driver. It doesnít matter if youíre in a bus, a boat, or a Boeing,... drive trains like smooth stability, and abhor constant or sudden changes.

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On the road since June '12 with Lincoln, the guard cat.
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element
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Old 07-22-2018, 09:37 PM   #16
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I am moving about 80#'s per HP and getting 7.6 MPG over 50,500 miles.

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 CR-V
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Old 07-22-2018, 09:42 PM   #17
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7 to 8 overall, depending on terrain.
200 gal tank/185 usable
M-11 Cummins @500hp
Allison 4060r (Allison 6 position hyd.retarder)

coach weighs 42k nekkid

I didn't buy the coach to stress on the fuel mileage. It is what it is..
Foretravel with tag axle.
retired truckdriver with 5m miles
Orygun Native
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Old 07-23-2018, 02:14 AM   #18
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Welcome to the forum.
Kelly and Jerry Powell with Halo (Lethal White Aussie), Nash the Rat Terrorist, and now Reid, the "Brindle we have no idea puppy"
2017 Thor Quantum W31, Ford E-450, Onan QG4000, Demco Kar Kaddy, Toytoada Prius.
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Old 07-23-2018, 07:57 AM   #19
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We have a 2017 Tiffin Allegro 36LA. On our last trip, towing a Fusion and running the generator, I think we got around 7 mpg. We use the cruise control set at 65 mph.

I agree with what others have said...never, ever rely on a salesman for accurate information.
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Old 07-23-2018, 11:00 AM   #20
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At 55,500 lbs. (plus the toad weigh wt. of 4,200 lbs.), we are averaging about 6.8-7.0 mpg over 45,000 miles. Generally, I cruise along at 55 mph in CA as that's the legal speed when towing.

In other states, I will move up to 65 mph.

Safe travels,
2015 Prevost Liberty Coach, 45 ft, 4 slides, 1.5 baths, 500 hp Volvo with 1,750 lb. ft. of torque.
2017 Lincoln MKX, AWD, 2.7 V6 335 hp twin turbo
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Old 08-04-2018, 02:15 AM   #21
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Thank you all for the input, I learned a lot. My last trip to the river I put just over 300 miles on and I have over half a tank according to the gauge. I plan to put more fuel in it next weekend when we head back out. But just looking at the gauge I would guess 7MPG. My first trip I don't think I set the trip right. This time I am using actual mileage.. Cruse control on 65 is the way to roll..
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Old 08-04-2018, 08:35 AM   #22
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You can't base your mileage calculations on a visual of the fuel gauge or the $ spent at the pump.
Fill the tank, record odometer, drive until you need to fill up again and check the odometer again.
Do this 3-4 times after various driving conditions, speed, terrain, load etc.
Divide the total gallons by the total miles driven.
This will give you a much more accurate idea of your mileage.
Southern Ontario
2014 Fleetwood Southwind 32VS 🇨🇦
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Old 08-04-2018, 08:35 AM   #23
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The LBCU reads 5-8% high on mpg. 9.5 is really closer to 9. Etc. It can not correct for generator usage.
Short trips, head and side winds, lots of uphill driving, city driving, and two lanes(lots of speed variation) reduce mpg. Best mileage is on interstates.

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2015 Fleetwood Discovery 40E on a Freightliner XCS chassis with a Cummins ISL9 pulling 1 and/or 2 motorcycles, '07 Honda Accord OR a 17' Runabout Boat.
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