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07-03-2013, 01:24 PM
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#15
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Senior Member
Fleetwood Owners Club American Coach Owners Club
Join Date: Mar 2011
Posts: 6,754
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Quote:
Originally Posted by 336muffin
Air filter
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...or a pin hole leak in a fuel line.
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2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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07-03-2013, 04:43 PM
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#16
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Senior Member
Newmar Owners Club Freightliner Owners Club
Join Date: Mar 2012
Location: Weston, Fl.
Posts: 916
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Quote:
Originally Posted by talrogers
I have a 40 ft. Safari Zanzibar powered by a 370 Cummins deisel. My last milage calc. was 4.7 mpg. What should I expect to get? What should I look at first?
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Air filter is the first thing I would check. Also tire pressure. CAC could do that to you. Have you owned the coach long. If so, what was your mileage before this. Let us know a little more about your coach ad how long you have had it. good luck..
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2003 Newmar Kountry Star 3905, Freightliner XC chassis with CAT 330. Winnie the black lab, pretty Airbus captain wife, retired airline pilot with 11 grandkids. UH-1 pilot (Huey) U.S. Army 1967-1983. RVN 68-69. Northern Idaho my summer home.
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07-04-2013, 05:22 AM
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#17
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Senior Member
Join Date: Nov 2009
Posts: 2,043
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Im with Engineer Mike on this... get the boost checked. Even a pressure loss of 5psi will drastically reduce the MPG while you may not "feel" that power loss if you're not working it too hard. Have you noticed a big drop in power? When you take it in have them check injectors (contribution) and pressure on the rail as well - just 1 or two damaged injectors can ruin MPG quick, fast and in a hurry. Have you pulled the oil dipstick lately to see oil level? Bad injectors can fail and wash the cylinders down quickly. In rare cases it begins to collect in the oil pan thus raising the oil level on the stick....
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94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified
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07-04-2013, 10:00 AM
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#18
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Senior Member
Winnebago Owners Club
Join Date: Jun 2010
Location: Iowa
Posts: 1,189
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One additional item is, how are you calculating the fuel mileage? Are you taking it off the computer or doing it yourself after each fill.
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Larry B, Luckiest Dreamer
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07-04-2013, 05:51 PM
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#19
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Senior Member
Monaco Owners Club
Join Date: Dec 2009
Location: Underwood WA
Posts: 451
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I have traveled from Washington State to Key West, FL and back the past four years, and I get a consistent 8 MPG on my CAT 350. I am pulling a CRV and set the cruise on 60 MPH. Dick
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Bev & Dick and Fuzzy the cat
2005 Safari Cheetah 38
2009 Honda CRV dinghy
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07-12-2013, 01:49 PM
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#20
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Community Moderator
Newmar Owners Club
Join Date: Feb 2011
Location: Point Pleasant Beach, NJ
Posts: 31,248
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Several things come to mind. Air filters clogged up a bit, the way you drive, the speed you drive,weight, and tire pressure. I get between 7-8 towing a Grand Cherokee.
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Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS
No amount of money can buy you an extra second of time.
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07-16-2013, 04:20 PM
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#21
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Senior Member
Country Coach Owners Club
Join Date: Jan 2011
Posts: 1,204
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High speed will = reduced fuel milage, generator will be about .5-1 gallon/hr, diesel heating system will impact your milage too. Going down the road with a Cummigs ISL400 we get about 7-8 mpg however when I'm running my utilities It drops to about 5-5.5 mpg. Calculated at fill ups.
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07-16-2013, 05:11 PM
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#22
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Senior Member
Fleetwood Owners Club
Join Date: Jul 2003
Location: NY
Posts: 604
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Is the Zanzibar new to you ? With mileage figures that far from normal , it sounds more like a calculation problem ..
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08 Diesel Bounder 38V
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