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Old 06-19-2012, 08:32 PM   #1
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Thumbs up MPG for 5.9 diesel

I have a 34ft winni adventurer with a 5.9 litre diesel & a 5 speed Allison tranny dose anyone know approx. MPG I should get. thanks for any help. Ray

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Old 06-19-2012, 08:42 PM   #2
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Not sure off hand as I do not own one but if you google it or go to www.ask.com and search it it should be able to help you

The Williams Family-Northeast, MD 21901
1999 Foretravel U320C-Gray, Black Mix W/ White
41 FT 9"-M11 450 H.P Cummins-1550 Ft Lbs of TQ
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Old 06-19-2012, 09:09 PM   #3
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I have a 38 ft 2005 w/ B 5.9 engine - weighs about 30,000 lb. Usually travel in 55 - 65 mph range. I usually get about 10 mpg. without a tow. Less around town.
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Old 06-19-2012, 09:17 PM   #4
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We have a 6.7 liter Cummins ISB and we got average 8.6 mpg this last trip. Lots of wind so sometimes it helped but mostly hindered our mpg. Before the Banks kit we were getting 7.6 mpg. I run it in power level 5 as 6 seems to get to max (1350 degrees) exhaust temp much faster. I try to turn off the cruise control before it hits high temps but not always successful but most times it is only for less than a minute. Wish I had a bigger motor so I did not need to watch it so closely.
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Old 06-20-2012, 06:06 AM   #5
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My 5.9L in a 36 foot motorhome averages about 9.5 combined Florida and mountains.
Jerry & Patsy Potter, Taz & Jake Jr.
2000 Winnebago Journey
2006 Ford Explorer 4X4
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Old 06-20-2012, 06:11 AM   #6
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MY is a 91Gulf Stream 31 foot I get 10mpg towing my Jeep or not. It's an 160 Hp
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Old 06-20-2012, 10:05 PM   #7
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Ditto on the around 10mpg.
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Old 06-21-2012, 08:20 AM   #8
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Interesting responses. My 1999 38' Diplomat with the 275 HP ISB, towing a Jeep Wrangler (3,200#), gets a range of 7.5 to 9.5 mpg; 7.5 in mountains and/or a head wind, both of which we have a lot of here in the mountain west. Last winter I got very near 10 mpg in the deserts of Arizona and California. All of these driving with the cruise set at 60 mph, at 1600 - 1650 rpm. No doubt I could do better at a bit slower speed, but I have to be above 57 mph to stay in 6th gear.
'99 Diplomat 38A- "High Plains Drifter"
'02 Wrangler Tender
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Old 06-21-2012, 09:16 AM   #9
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Cummins ISB 5.9 gets 12 towing a toad in Nebraska, 10 in the mountains. GCVW is about 29000.
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Old 06-21-2012, 09:20 AM   #10
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In a 37', 23,000lb rig, with a 5.9L, I have averaged, over 65,000 miles, 9.90MPG. Naturally, it ranges from 8.5MPG to 13.0MPG depending on conditions and route. Travel between 55-65MPH.
'02 Winnebago Journey DL, DSDP, 36' of fun.

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Old 06-21-2012, 12:17 PM   #11
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We have a Cummins 5.9l 300 hp in a 39 foot rig pulling a 3500# Saturn Vue. Drviing 62-64 mph, we have averaged 9.5 mpg for over 38000 miles. Worst mpg was 8.2 in the Rocky Mountains, and the best was 10.9 in Kansas going east.

Jim and Lynda, (Sophie, Jake, attack trained killer Shi-Tzus :-))

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