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06-04-2014, 03:20 PM
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#1
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Member
Join Date: Mar 2014
Posts: 39
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Generator fuel consumption
Hi all,
Just about ready to head out for the first time ever. Planning on dry camping in Southern Utah for a couple days next week before heading east. 111 today in Phoenix and can't wait to leave!!!
Anyway, quick question: Any idea on how much fuel my 14 yr old Onan 7500 will use on an hourly basis? Just had Freightliner change fluids/filters and give it bill of good health.
Thanks much.
Mike
2000 Allegro Bus with 300HP Cat
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06-04-2014, 03:46 PM
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#2
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Senior Member
Fleetwood Owners Club
Join Date: Jan 2010
Posts: 1,391
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My 7500 runs about 3/4 gal per hour running two roof airs.
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06-04-2014, 04:31 PM
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#3
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Community Moderator
Newmar Owners Club
Join Date: Feb 2011
Location: Point Pleasant Beach, NJ
Posts: 31,559
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1/2 to 3/4 gal per hour depending on the load.
__________________
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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06-04-2014, 04:44 PM
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#4
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Oct 2010
Location: Lake Havasu City, AZ
Posts: 1,717
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from http://www.cumminsonan.com/www/pdf/s...ets/a-1486.pdf
7.5 HDKAT 0.21 Gal/hr with no load, 0.56 Gal/hr with half load and 0.96 Gal/hr with a full load. YMMV.
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2019 Newmar Dutch Star 4328 K2
2017 Grand Cherokee Summit 5.7
2008 Beaver Contessa 40' Pacifica 425 Cat
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06-04-2014, 09:36 PM
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#5
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Senior Member
Newmar Owners Club Freightliner Owners Club
Join Date: May 2012
Location: Today? Clayton, North Carolina
Posts: 5,093
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I use .6gph as a burn figure for my Onan 7500. For two years that has worked out very closely when I buy fuel.
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John and Diane (RIP Lincoln, 21 FEB 22) RVM103 NHSO
Fulltimers since June, 2012
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element
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06-04-2014, 09:49 PM
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#6
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Senior Member
Join Date: May 2013
Location: Simpsonville, SC
Posts: 167
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7.5 kw Onan with just over 600 hours has used about .6 gph since we bought her new in 2005....everyone's numbers seem spot on. That's usually running 2 ac units, refer, and sometimes hot water as well. Probably using half power (31 of 62 amps available) or so.
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John & Susan Johnson with Bailey, the Goldendoodle
Towing our 2016 Cadillac SRX
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06-05-2014, 12:45 AM
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#7
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Senior Member
Join Date: Oct 2012
Location: Denton, TX, 76207
Posts: 2,160
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I wish it would be practical to have a second fuel tank for the generator and hydronic burner so that we could use dyed fuel!
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Steve Pinn
2008 Newmar Essex-4514
2009 Honda CRV
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06-05-2014, 01:10 AM
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#8
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Senior Member
Newmar Owners Club Freightliner Owners Club
Join Date: May 2012
Location: Today? Clayton, North Carolina
Posts: 5,093
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Quote:
Originally Posted by spinn
I wish it would be practical to have a second fuel tank for the generator and hydronic burner so that we could use dyed fuel!
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I'm not sure it would be practical even if it were practical. 
In the past two years I've run about 175 gallons through my gen. What's the tax we'd save? About 15-20 c/g?
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John and Diane (RIP Lincoln, 21 FEB 22) RVM103 NHSO
Fulltimers since June, 2012
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element
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06-05-2014, 01:16 AM
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#9
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Senior Member
Join Date: Oct 2012
Location: Denton, TX, 76207
Posts: 2,160
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Its more the principle than the practicality :-)
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Steve Pinn
2008 Newmar Essex-4514
2009 Honda CRV
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06-05-2014, 04:25 AM
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#10
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Senior Member
Join Date: Nov 2009
Posts: 2,043
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Using red fuel got me thinking.. what would be the timeframe for the ROI if adding another fuel tank for gensets and hydronic heating?
I found published numbers at the US EIA. It looks like the average tax for Fed and State combined averages out to around 45 cents/gal for all of us. So using that number I chose an average of 2000 running hours on a genset, which is not unusual for *most* RVers for the time they own their unit. If the diesel units burn on average of .75 gal/hr that would equate to around 1500 gallons used. Average price now is $4.00/gal or $6000.00 for the 2000 hours of use. If you save the 45 cents per gallon it would bring the cost down to $3.55/gal and change the total cost to $5325.00. $675.00 difference over approx 2000 hrs of use. Not sure how many could add an additional fuel tank for $675.00 not to mention being able to find red fuel while traveling :-) I do agree with Steve.... it's the principle, not the practicality. hehe
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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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06-05-2014, 05:55 AM
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#11
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Senior Member
Join Date: Aug 2011
Location: Near Toronto, Canada
Posts: 1,842
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In every State & Province I've worked in you can fill out a form and submit it along with the receipt(s) and get a refund of the 'road taxes' on fuel (gas or diesel) that was used for "off the road" purposes.
We do it regularly, rarely is it even questioned.
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Ted 'n' Laurie, plus Jackson (aka Deputy Dog, the Parson Russell Terrier 'fur kid') and, Rylie (who crossed the Rainbow Bridge June 14, 2012).
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06-05-2014, 07:10 AM
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#12
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Senior Member
Join Date: Oct 2012
Location: Denton, TX, 76207
Posts: 2,160
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Quote:
Originally Posted by Murf2u
In every State & Province I've worked in you can fill out a form and submit it along with the receipt(s) and get a refund of the 'road taxes' on fuel (gas or diesel) that was used for "off the road" purposes.
We do it regularly, rarely is it even questioned.
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I did not know that Murf2u, thank you
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Steve Pinn
2008 Newmar Essex-4514
2009 Honda CRV
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06-09-2014, 12:28 PM
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#13
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Senior Member
National RV Owners Club Holiday Rambler Owners Club
Join Date: Sep 2013
Location: Southern Lancaster County Pa
Posts: 976
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You might want to look at the post:
Nifty way to run a Honda or Yamaha inverter Generator from your motorhome. It is in the Class A forum.
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