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11-23-2021, 09:58 PM
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#1
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Senior Member
Brand: Thor Motor Coach
Model: Vegas 25.6
State: New Mexico
Posts: 5,127
THOR #20220
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85 octane question
We just traveled thru WY NE CO and see 85 for 15 to 30 cents less per gallon
Can this be used in our Ford engine vegas?
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11-23-2021, 10:16 PM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 6,931
THOR #13932
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It's fine.
We have 85, 89, 91 as our only options here. No 87, no 93.
My 26,000 miles have been on 85 octane.
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11-23-2021, 11:02 PM
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#3
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Senior Member
Brand: Thor Motor Coach
Model: Chateau 24F
State: Ohio
Posts: 4,186
THOR #16721
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My motto is if it will run on lawnmower gas... use it!
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11-23-2021, 11:49 PM
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#4
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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If it can burn: your engine can burn it...
... but it will probably not give you the best performance.
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11-23-2021, 11:54 PM
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#5
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Senior Member
Brand: Thor Motor Coach
Model: Vegas 25.6
State: New Mexico
Posts: 5,127
THOR #20220
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Thanks all
__________________
LAS CRUCES 2020 Thor Vegas 25.6
Lora & George. Golden Retriever & Multi-Gen Australian labradoodle & new ALD in March. Happy Campers!! E Biking, Hiking, Tennis, Scuba,Fishing,Cross Country Skiing, Snowshoeing. Retired H.S. Principal, Sr. IT Engineer, Life & Health Insurance Agent
"Today is a Gift and Why it is called the Present"
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11-24-2021, 12:04 AM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: Citation
State: Texas
Posts: 920
THOR #8139
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Quote:
Originally Posted by Scubawise
We just traveled thru WY NE CO and see 85 for 15 to 30 cents less per gallon
Can this be used in our Ford engine vegas?
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I'm pretty sure the Ford V10 is not a flex-fuel motor!
Check your owners manual BEFORE filling with E85.
If you've already filled you should use it asap, with frequent stops for a few gallons of E10, E0 if you can find it would be better
Edit: 85 is not the octane rating it's the % of ethanol, not good!
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11-24-2021, 12:15 AM
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#7
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Senior Member
Brand: Thor Motor Coach
Model: Chateau 24F
State: Ohio
Posts: 4,186
THOR #16721
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It's printed on the gas cap on mine... Without going out and looking I believe it's 10%. Most gas in Ohio is "may contain up to 10% ethanol". But you can buy "racing fuel" at most Sunoco stations with no ethanol... expensive though.
The extra octane is a waste of money IF your engine doesn't require it. Some people claim it runs better, but the science says otherwise. Use what your manual recommends. Higher octane is a waste... lower octane can cause knocking which could do damage long term.
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11-24-2021, 12:36 AM
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#8
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,389
THOR #7035
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Quote:
Originally Posted by abjbrtd
I'm pretty sure the Ford V10 is not a flex-fuel motor!
Check your owners manual BEFORE filling with E85.
If you've already filled you should use it asap, with frequent stops for a few gallons of E10, E0 if you can find it would be better
Edit: 85 is not the octane rating it's the % of ethanol, not good!
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The discussion is regarding the lower OCTANE gas available at higher altitudes, not ethanol content. It's best not to conflate the two.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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11-24-2021, 12:45 AM
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#9
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 29M
State: Texas
Posts: 2,728
THOR #11781
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Most modern engines are designed to run on fuel with an octane rating of 87. Sure, it will run on 85 but you will be getting less performance, poorer fuel mileage and decreased engine life. That info is all contained in the owners manual. If you are talking about E85, it will kill your engine unless you have a flex fuel motor.
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Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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11-24-2021, 12:52 AM
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#10
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Senior Member
Brand: Thor Motor Coach
Model: Vegas 25.6
State: New Mexico
Posts: 5,127
THOR #20220
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Thx saw this
Your engine is designed to run on 87 octane at sea level. It will run just fine at 4000 ft and above on 85 octane. With lower air pressure comes lower combustion chamber pressure and reduced chance of ping. Don't waste your money on octane you don't need.Jan 28, 2018
__________________
LAS CRUCES 2020 Thor Vegas 25.6
Lora & George. Golden Retriever & Multi-Gen Australian labradoodle & new ALD in March. Happy Campers!! E Biking, Hiking, Tennis, Scuba,Fishing,Cross Country Skiing, Snowshoeing. Retired H.S. Principal, Sr. IT Engineer, Life & Health Insurance Agent
"Today is a Gift and Why it is called the Present"
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11-24-2021, 01:17 AM
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#11
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Senior Member
Brand: Thor Motor Coach
Model: Four Winds 26B
State: Indiana
Posts: 389
THOR #6414
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Because the air is less dense, less air flows to your car's engine. This translates to a slightly richer air-fuel ratio, and deters engine knock. For that reason, you'll find that regular gas carries an 85 octane rating here in Denver and throughout Colorado, Wyoming, Utah and Montana.
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Roger, Dawn, and Roxie
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11-24-2021, 02:07 AM
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#12
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Senior Member
Brand: Still Looking
Model: Sunstar 29VE Winnebago
State: Texas
Posts: 5,651
THOR #13058
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This is where you can simply ignore the science in favor of the math $.20 - $.30 cents / gallon of gas is cheaper; so buy it
This video is why I may never go Glamping in Montana
https://missoulian.com/grizzly-bear-...dfadb4dfe.html
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2019 Sunstar 29ve; Toad Lincoln Navigator; RVi Brake 3 & Command Center; Roadmaster Nighthawk Tow bar & Baseplate; Sumo Springs; Safe T Plus; Onan EC-30 AGS; Vmax 250ah AGM; T-Mobile Internet; H/W Heater / Chassis Disconnect Switches; Southwire Surge Guard 44270 & 34951 w/Monitor 40301; Jet Flo Macerator; Alpine SPE500 Speakers; Visio M21D-H8R
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11-24-2021, 04:51 AM
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#13
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 4,183
THOR #6411
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Quote:
Originally Posted by airforceret
Because the air is less dense, less air flows to your car's engine. This translates to a slightly richer air-fuel ratio, and deters engine knock. For that reason, you'll find that regular gas carries an 85 octane rating here in Denver and throughout Colorado, Wyoming, Utah and Montana.
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True the air is less dense, but your engine has a one bar Manifold Air Pressure (MAP) sensor and an Initial Air Temperature (IAT) sensor that allows the Engine Computer Unit (ECU) accurately determine the actual air density and inject the correct amount of fuel for the computed density. The feedback from the three O2 sensors ensures the fuel air ratio is correct. The reason that 85 octane rated fuel is available is the air density effectively lowers the compression ratio sufficiently to allow the engine to run successfully at altitudes 4,000 ft ASL.
__________________
Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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11-24-2021, 10:21 AM
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#14
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Senior Member
Brand: Thor Motor Coach
Model: Vegas 25.6
State: New Mexico
Posts: 5,127
THOR #20220
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Quote:
Originally Posted by Beau388
True the air is less dense, but your engine has a one bar Manifold Air Pressure (MAP) sensor and an Initial Air Temperature (IAT) sensor that allows the Engine Computer Unit (ECU) accurately determine the actual air density and inject the correct amount of fuel for the computed density. The feedback from the three O2 sensors ensures the fuel air ratio is correct. The reason that 85 octane rated fuel is available is the air density effectively lowers the compression ratio sufficiently to allow the engine to run successfully at altitudes 4,000 ft ASL.
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Does that mean whenever 85 is available we can use?
__________________
LAS CRUCES 2020 Thor Vegas 25.6
Lora & George. Golden Retriever & Multi-Gen Australian labradoodle & new ALD in March. Happy Campers!! E Biking, Hiking, Tennis, Scuba,Fishing,Cross Country Skiing, Snowshoeing. Retired H.S. Principal, Sr. IT Engineer, Life & Health Insurance Agent
"Today is a Gift and Why it is called the Present"
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11-24-2021, 01:13 PM
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#15
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Quote:
Originally Posted by dkoldman
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Haven't we had enough of "ignoring the science"?
__________________
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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11-24-2021, 01:36 PM
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#16
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Senior Member
Brand: Thor Motor Coach
Model: Vegas 25.6
State: New Mexico
Posts: 5,127
THOR #20220
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Quote:
Originally Posted by Bob Denman
Haven't we had enough of "ignoring the science"?
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Oh no stop. Stop montana is excellent..go camping..even KOA has bears ..just call our bear holiness. They will send an F15. JOKING
__________________
LAS CRUCES 2020 Thor Vegas 25.6
Lora & George. Golden Retriever & Multi-Gen Australian labradoodle & new ALD in March. Happy Campers!! E Biking, Hiking, Tennis, Scuba,Fishing,Cross Country Skiing, Snowshoeing. Retired H.S. Principal, Sr. IT Engineer, Life & Health Insurance Agent
"Today is a Gift and Why it is called the Present"
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11-24-2021, 01:43 PM
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#17
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Senior Member
Brand: Thor Motor Coach
Model: Chateau 24F
State: Ohio
Posts: 4,186
THOR #16721
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Quote:
Originally Posted by Bob Denman
Haven't we had enough of "ignoring the science"?
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You're probably thinking of "alternative facts".
But on the octane, there should be a section/chart in the owners manual detailing type of fuels to be used in the engine - similar to the way they explain oil specs for different climate/conditions.
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11-24-2021, 01:48 PM
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#18
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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... And there was!
__________________
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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11-24-2021, 03:29 PM
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#19
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 4,183
THOR #6411
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Quote:
Originally Posted by Scubawise
Does that mean whenever 85 is available we can use?
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Yes if you are consistently above 4,00 ft above sea level. Should you descend below that elevation, you should use 87 octane gasoline. It works about the same as the cold air pressure in your tires. As you go up in elevation the outside air pressure decreases so the air pressure in your tires will increase. The reverse is true when you descend in elevation.
Most modern gasoline engines have knock sensors to prevent damage if fueled with a lower octane fuel than is recommended. The Ford V-10 does not use knock sensors, so it up to the owner to use the proper fuel.
__________________
Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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11-24-2021, 03:32 PM
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#20
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Senior Member
Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 6,931
THOR #13932
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About alternative facts:
The sky is not blue
The sun does not set in the West
Walnuts are not nuts.
Name some others.
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