Go Back   Thor Forums > Thor Community Forums > Thor Owners Community Discussions
Click Here to Login

Thread Tools Display Modes
Old 08-31-2017, 12:02 PM   #1
Senior Member
Brand: Thor Motor Coach
Model: challenger 37YT
State: Michigan
Posts: 205
Generator gas consumption

Got setup camping at 11 pm Tuesday, Generator has run nonstop since.
Yesterday with both air units, at least one the night time. Checked my gas gauge and it hasn't moved from full. Was going to go buy about 20 gallons so when we leave, we don't have to fuel up for a while.
Book says that 5500 will use a half gallon at half load and a gallon at full, per hr.

I'm thinking I should've used a quarter of a tank of fuel by now.

Any thoughts on this ?

rick kirby is offline   Reply With Quote
Old 08-31-2017, 12:31 PM   #2
Senior Member
Brand: Still Looking
State: Texas
Posts: 3,319
I think your fuel consumption estimate may be a little high because at night air conditioners don't run steady most of the time. Onan specs show .3 GPH at no load and .6 GPH at 50%, which is around 23 Amps. Averaged over one day and two nights you may have used less than you think.

I have no idea why it won't show a decline on fuel gauge -- hopefully others may know. I've driven many cars that when tank is full, it has to be driven quite a bit before gauge moves at all.

If you started out with full tank, i wouldn't worry about refilling so soon just because of generator. You should still have plenty left.


Chance is offline   Reply With Quote
Old 08-31-2017, 12:45 PM   #3
Senior Member
SuperD's Avatar
Brand: Thor Motor Coach
Model: 2017 Windsport 29M
State: Indiana
Posts: 3,553
Chance is right, your generator will use less fuel than stated because your AC is cycling the compressor off and on meaning less fuel burned. My coach fuel gauge doesn't move for quite a while after a fill up, wouldn't worry. The generator will starve for fuel once you get down to 1/4 tank so you'll still have plenty left.
USMC Veteran
FMCA 101070S

Dave & Myra
One day your life will flash before your eyes,
make sure it's worth watching!
SuperD is offline   Reply With Quote
Old 08-31-2017, 12:54 PM   #4
Senior Member
Brand: Thor Motor Coach
Model: challenger 37YT
State: Michigan
Posts: 205
Thanks guys, I'm still in the learning mode with how things work on this coach. I think I'll still go buy 12 gallons for later. I had it topped right off thinking it would use a whole tank in the 5 days we're here.
rick kirby is offline   Reply With Quote
Old 08-31-2017, 01:07 PM   #5
Senior Member
JamieGeek's Avatar
Brand: Thor Motor Coach
Model: Axis 24.1
State: Michigan
Posts: 7,127
On our Axis (yeah E350 chassis) I have to drive over 100 miles (10+ gallons) before the fuel gauge moves at all.
2014 Thor Axis 24.1
2016 C-Max Energi
2018 Chevy Bolt
blog - https://spareelectrons.wordpress.com/
JamieGeek is offline   Reply With Quote
Old 08-31-2017, 06:08 PM   #6
Senior Member
Bob Denman's Avatar
Brand: Still Looking
Model: S.O.B.
State: New York
Posts: 6,772
When you guys are "off the grid": what percentage of time (approximately), is spent with the generator running?
Have any of you also tapped into solar power?
Does that make for a significant reduction in generator usage?

Good Sam Member 843599689
FMCA Member F473304

Current coach: Tiffin Wayfarer 24 BW
Former coach: Thor Outlaw 29-H
Bob Denman is online now   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by Thor Industries or any of its affiliates. This is an independent, unofficial site.

All times are GMT. The time now is 09:11 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2