latigergolfer
Headland, Alabama
Senior Member
Joined: 11/16/2003
View Profile
 Offline
|
We get 7-9.5 no toad 6-8 with toad relatively flat terrain. Mileage worse over 65 mph (tetsosterone makes the 65 mph hard to do) a mile or so under the expressed values.
Rick and Suzanne Bendinger
Headland, Alabama
2006 Revolution LE 40L (DOCGG)
GMC Envoy Toad
Gage and Max the grans, and AUGIE the Rattie
WAR EAGLE!!!
|
WTD44
Ca.
Senior Member
Joined: 09/01/2003
View Profile
Offline
|
T18skyguy wrote:I saw a show on fuel tank design that was real interesting. The inlet for the tank is placed so that the tank only fills to 80% capacity. It's to allow for the expansion of fuel as it warms up. If the tank would fill 100% it could potentially burst from this expansion. I do think it tends to skew the mileage figures of otherwise well intentioned folks.
If one consistantly filled up to 80 %, the mileage would seemingly be accurate.
'07 H.R. Scepter 40 ' PDQ
Cummins 400 ISL
Alison 6 speed World
'04 Jeep Wrangler X
Wife and,
Sparky the Wonder Dog
|
wolfe10
Texas
Senior Member
Joined: 10/08/2000
View Profile
Offline
|
Checking MPG on any single or even a few tanks is often inaccurate. The 80% fill suggested by some is not an issue if it is consistent.
The issue is that even a one degree difference slope in the pavement at different pumps can change by many gallons how much fuel it takes to bring the fuel level to exactly the same place in the filler neck.
We record fuel MPG on every drop that has ever gone in our tank. BUT I only rely on MPG calculated on a minimum of 2000 miles.
I also fill up at the same station at the same pump (just because it is convenient and near where I store the coach)just before storing it, so "trip" averages are pretty valid.
Brett Wolfe
1993 Foretravel 36' U-240
Cat 3116, Allison 3060
Caterpillar RV Engine Owner's Club: www.catrvclub.org
|
CertifiedFunds
Middleburg, Florida
Senior Member
Joined: 12/06/2005
View Profile
Offline
|
CK wrote:you will get many responses ,here is the truth 6.5 to 7.2 if you run 40 mph or 80 mph thats it ,,some people will flat out lie and tell you they get 12 mpg do not believe them
Maybe you are the one lying! Since cummins worked on my ECM I get around 8-8.5. And 250MPG down hill.
'06 45' Tiffin Zephyr
'05 F350 Toad
DW Tammy & Son Gage
|
2cyber71
Pennsylvania
Senior Member
Joined: 11/21/2003
View Profile
|
I get about 7.5 on flat roads towing a Liberty....much less in the mountains....Mine is a Cummins 400ISL. About 32,000 with the jeep
2007 Itasca Ellipse 40FD
Lucy 3 yr old Lakeland Terrier, in AKC Agility Training
Campground Videos
Lucy gets an Agility Ribbon, 2nd place AKC Trial, Finger Lakes Kennel Club
|
|
|
WTD44
Ca.
Senior Member
Joined: 09/01/2003
View Profile
Offline
|
I don't personaly own a CAT but my neighbor has a 40 foot Fleetwood with a CAT (360 I think) and he always gets about 1/2 MPG less than I do. I have averaged 7.6 (over 12,000 miles) towing a Jeep throughout the 11 western states. Best ever was east bound, got 8.8 not towing and worst was west bound, towing with headwinds > 6.9. Now that fuel is high, I am trying to drive 60 or less and on just one trip to Oregon we averaged 8.1. Not really much of an improvement, but this number was only based on 1500 miles. My TOTAL weight averages 36,500
|
Whtbass
johnsburg, Illinois
Senior Member
Joined: 05/14/2002
View Profile
Offline
|
dropping down to under 65 from 75 improved mileage from5.9to 6.9. Not worth the ffort to constantly watch the speed. Just set the cruise at whatever speed limit is and try to forget about fuel consumption.
Dave & Mary Anne
2006 Mountain Aire 43 ft
400cummins
2005 Jeep Grand Cherokee Limited
Brake Buddy
Brittany Named Cassie
|
FritoBandito
Full Timers
Senior Member
Joined: 02/12/2004
View Profile
Offline
|
Diplomat Don wrote:Because of the design of the fuel tanks on most DP's, you can't get an average mpg from one tank to another. At any given fill-up, depending on coach angle, these tanks can be off by 5-10 gallons. Any good mileage estimate needs to be made over several fill-ups.
Right on, Diplomat Don.
It drives me "nuts" to hear someone tell me that they checked their MPG on one (or two) tank(s) of fuel. And then claim they know what mileage they get.
I KNOW my MPG. Because I've recorded every gallon, price, location and date of every fill-up since we bought our DP. Anal? Maybe ... but I've been doing it on every vehicle I've ever owned since 1954. Cars, motorcycles, motor homes, etc.
It's just something we do.
|
Green D
Van,Tx
Full Member
Joined: 04/01/2007
View Profile
Offline
|
I find it interesting about all the number figuring and all. I installed the VMSpc and was told this was more accurate then trying to hand figure it. I thought the big rigs had the trip tek is it not accurate? BTW My sweet little ride gets 10.5 avg towing :-)
Green D
98 Discovery 36T 275HP Cummins 6spd Allison
98 Jeep GC
VMSpc
|
lanerd
Ridgecrest, CA
Senior Member
Joined: 03/03/2003
View Profile
Offline
|
I also agree with Don. We too did the Alaskan trip this summer (almost 5 months and a little over 9500 miles) and I filled my tank (usually when it was about 1/2 full) 28 times. Of those 28 times, I registered an mpg of over 11 and a couple of 6.7's. Over the entire 28 fill-ups however, I averaged 8.7. I definitely contribute the 11 to not being able to fill the tank as full as I did on the previous fill-up, and the 6.7's to actually filling the tank more than I did on the previous fill-up. Confusing?
Actually, during one portion of our trip, I averaged well over 50 mpg.. ..of course the MH was riding on one of the Alaskan Marine Highway ferries and the only time the MH was running was to load/unload on the ferry and a short jaunt to the rv park at each of the stops (Juneau, Sitka, Ketchikan and Prince Rupert) .
In any case, for accurate mpg, you must do it over a multiple fill-up condition or else the readings will be false. Of course the exception is if you can fill up at the exact pump each and every time.... then you can get good readings.
Ron
Ron & Sandie
'08 Safari Simba SBD35
86 Toy 4x4 P/U for Toad.
Tow Bar: Sterling
Brakes: Unified
Toys:
Yamaha 660R Raptor (mine)
Honda 350ES Rancher (hers)
64 Fairlane w/351c - 4sp
Both Fed CS Retirees
Hobbies:
DW's: Quilting
Mine: DW
RETIRED!! How sweet it is....
|
|
|
