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Old 10-20-2016, 05:51 PM   #29
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My MH has a CAT 330 (Diesel) engine anmd I get around 7-7.5 mpg if I am driving in the mid 60mph range. I have a 150 gallon tank and honestly it foams so much when I fill it that it is rarely full because I have to trickle it in and it takes I usually go from an indicated 3/4 tank to 1/2 tank and then start looking for fuel. I usually get 400 ish miles out of that much fuel and honestly I like to take breaks more often than that for the sake of my sanity and legs and back!MH is 40' long and 2 sides, running at about 29,500 lbs loaded.
2005 Airstream 396 XL Land Yacht with Cat 330 C7
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Old 10-20-2016, 09:36 PM   #30
Join Date: Jul 2010
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2005 Fleetwood Excursion 39S
Cat C7
100 Gal tank
6.9 MPG at about 65MPH
690 Miles

Might get slightly better mileage, haven't checked it in a couple of years. I'll push 650 miles on a tank if I know I can get fuel when I want it.

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Old 10-20-2016, 09:56 PM   #31
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150 gal of diesel
8.5 mpg towing the Honda
problem is at about 500 miles, generator wont run. So in hot weather, we can only do the 500. when in cooler weather, I'll go 900 miles, if I know fuel will be close by.

Would like to extend the pick up for the genny.. Maybe a good project this winter.
Bill & Brigitte
06 Windsor PEQ, Cummins 400 ISL
2014 Honda CRV
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Old 10-21-2016, 01:24 PM   #32
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I forgot to mention that if we're using the genny I start looking for a place to fill up after the tank is 1/2 full, as the genny stops running at 1/4 tank!
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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Old 10-21-2016, 01:32 PM   #33
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Post the avarage total miles you get with a full tank of gas- 810mi

How big is your fuel tank on gallons-150 gal

the size of the engine-C13CAT 12.5l

And how big is your mh-42'

Avarage city and freeway/highways -5.4mpg
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Old 10-21-2016, 01:36 PM   #34
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Around a 1/4 tank I start looking. That assumes I am not out in the middle of nowhere. GasBuddy is a good app to use if you have a smartphone and cell service. Especially if you have a diesel like I do. I generally plan ahead of time the general vicinity where I am going to fuel using gasbuddy for pricing and # of stations on my route.
Watch the height on any fuel station you drive into. I have watched many of videos of coaches getting their tops pealed back or ac's knocked off. Ain't pretty having those open holes in the roof of your rv. And entrance/exit strategy and which side of the pumps you have to be on. My coach has fillers on both sides so I am lucky there.
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Old 10-21-2016, 01:37 PM   #35
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150 gallon tank
46,700# DRY weight (50,000 loaded and 4,400 more for the Odyssey)
GVWR 54,000#'s and GCVWR 69,000#'s
7.6 MPG average for 45,000 miles
Normal cruising speed of 60-62 MPH (1350 rpm)
ISX 650/1950
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 Jeep JKU Dragon Edition
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Old 10-21-2016, 01:42 PM   #36
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100 gallon tank. Around 7 to 8 mpg. Fill when 1/2 to 3/4 gone. Use Gas Buddy app and PenFed credit card to help get best fuel price.
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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Old 10-21-2016, 04:54 PM   #37
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The MAX I've traveled on a tank was 547 miles. Wytheville, VA to Brunswick, GA November 2010. 75 gal tank, 8.1GM, 38'11" Itasca. 23,200#s.
Sarver, PA/Crystal River, FL/Shelocta, PA FMCA 335149 W3TLN
2005 Suncruiser 38R W24, no chassis mods needed 2013 Honda Accord EX-L 2008 Honda Odyssey EX-L

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Old 10-21-2016, 05:00 PM   #38
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Originally Posted by Racklefrack View Post
43' motorhome, 8.9L Cummins ISL
150 gallon tank... averaged 7.8 mpg on last trip of 2,497 miles.
Tire pressures are set for the weight of the rig with full fuel and fresh water tanks, towing a car and fully loaded for a long trip - 110 psi on steer axle, 100 psi on drive axle, 90 psi on TAG.

Mathematically, I can get 1,200 miles out of a tank, but of course I never let it get down that far. My gauge is also not all that accurate, so when it says I have a half a tank of fuel I actually only have about 1/3 of a tank. (I know this because at half a tank on the gauge I can squeeze in 90-100 gallons). I typically plan out fuel stops along the way for convenience and price, not for how much is left in my tank, so I almost always have more than half a tank of fuel on board.

I typically drive 65-ish mph except in California where I drive right around 60 because of the towing / 3-axle speed restriction. I don't care about an extra fraction of a percent of fuel mileage, I drive to match the conditions of the road and traffic. On most highways / freeways 65 works out very well... traffic can still go around me if they want, but I'm not coasting along like a rolling road block either.

That said, I have to admit that on our last leg home in Nevada the speed limit was 70, and because 1) I was alone on the rig, 2) I wasn't towing our car and 3) all the wet tanks were basically empty, I set the cruise control to 75 and sailed home. Handled like a dream and the fuel mileage only went down about .4 gpm (it was ridiculously windy that day). That .4 would make a significant difference on a long drive cross country, but I was only about 150 miles from home so it didn't even make a dent.
I second this post. Same engine in a 43' Itasica Ellispe GD. About 1200 miles to fill up or every other day when cross country traveling. I get between 9-11 mpg without a towed and about 1 mpg less pulling the towed. Sweet speed is about 65 mph on the flats but 70 is more common out west. Oh and plus DEF. Just filled up in Tennessee, $2.09 gal. for #2 diesel.
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Old 10-22-2016, 08:42 AM   #39
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I have a 8.1 gas Workhorse and have gotten as good as 10.5 going through Texas with a stiff tail wind and as bad as 4.5 running into a 30 mph head wind. I figure I average around 7. I pull a Jeep so backing up is not an option so I fill up when it gets just below 1/2 tank unless I know of a station that I can use. I use Flying J with RV lanes for my convenience and the discount through Good Sams.
Mody n Domy
full timing it
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Old 10-23-2016, 10:41 AM   #40
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Originally Posted by Arch Hoagland View Post
I don't use Pilot, Flying J, etc. Too many morons on cellphones not watching where they are going or leave their car in front of the pump while they shop, etc.
That may be true for the "regular" fillup lanes, but we like using the Pilot/Flying J's that have dedicated RV lanes. We keep in the RV a copy of their directory that identifies those stations. Fellow RVers are more considerate and can run any errand they need in the time it takes to pump that much gas!
2019 Newmar Bay Star 3626
(Replaced our 2014 Newmar Bay Star 3308)
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Old 10-26-2016, 06:50 PM   #41
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I average around 8 mpg with an 02 Ford V-10. 75 gallon tank but I monitor Gas Buddy and fill up whenever I find cheaper gas, especially when about to enter a new state.

2002 National Sea Breeze LX 8341
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Old 10-28-2016, 10:47 AM   #42
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i bought a new coachman sportscoach crosscountry 404rb this past march. it has a 340 cummings and have put 5500 miles on it so far. I put cruise at 65 and I have 100 gal tank and am avg 9.5 mph. love my coach.
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