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What Gas Octane Rating For Mower ? #5400725 04/12/20 12:48 AM
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ChrisD46 Offline OP
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While I've used 87 octane rated gas (treated afterwards with ethanol remover) ) in my lawn mowers - I wonder if there is a benefit to moving up to 89 or 91 octane rated gas for my Honda ?


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Re: What Gas Octane Rating For Mower ? [Re: ChrisD46] #5400736 04/12/20 01:21 AM
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Doubt it ... it won't cut grass any faster with 91.

Re: What Gas Octane Rating For Mower ? [Re: ChrisD46] #5400750 04/12/20 02:21 AM
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Superflan Offline
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Does a thing such as an Ethanol remover treatment really exists?


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Re: What Gas Octane Rating For Mower ? [Re: ChrisD46] #5400773 04/12/20 04:13 AM
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FT92 Offline
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i tried higher octane one time a few years ago...ran 10 gallons worth thru my push mower and the rider ...I didn't notice any difference so why spend the extra $$

Re: What Gas Octane Rating For Mower ? [Re: ChrisD46] #5400777 04/12/20 04:50 AM
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Kamele0N Offline
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Waste of resources smile

Lawnmover wont notice...I would use 100 octane (RON) only in a high revolving 2T OPE equipement (ie huskvarna 550xp chainsaw & equivalents)


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Re: What Gas Octane Rating For Mower ? [Re: ChrisD46] #5400812 04/12/20 06:30 AM
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dave123 Offline
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Most of our E0 in the area is in 91 octane and is generally what everyone uses. I only run VPracing C9 in strokes everything gets same ratio. No clue what ethanol remover is or how that works. No E0 in the area??

Re: What Gas Octane Rating For Mower ? [Re: ChrisD46] #5400828 04/12/20 06:57 AM
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Originally Posted by ChrisD46
While I've used 87 octane rated gas (treated afterwards with ethanol remover) ) in my lawn mowers - I wonder if there is a benefit to moving up to 89 or 91 octane rated gas for my Honda ?

Instead of increasing your octane, I would use an ethanol free gas which the farm places sell.


The "thinking" man's friend.
Re: What Gas Octane Rating For Mower ? [Re: ChrisD46] #5400861 04/12/20 07:40 AM
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wag123 Offline
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Small air cooled lawnmower engines have such a low compression ratio that they will run good on 81 octane gas, if you could buy it.
87 octane gas will work fine. Higher octane than this would be a waste of money, but E0 would be preferable to E10 if it is readily available in your area..

Re: What Gas Octane Rating For Mower ? [Re: ChrisD46] #5400863 04/12/20 07:44 AM
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ARCOgraphite Offline
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If the 87 is a bad batch sometimes I would get some 93.
But Most mowers are VERY low compression and don't require high octane.

I am not familiar with the Kawi twins - or similar - on riders.

Most of these engines are low specific output, mid rpm, so I wouldn't expect anything over 9:1.

But I haven't researched it, so IDK !


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Re: What Gas Octane Rating For Mower ? [Re: ChrisD46] #5400866 04/12/20 07:45 AM
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Audios Offline
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I usually fill my can with 93, but Im sure after 6-8 months its degrades to regular since I dont go through it so much. They were built for regular, you should have no problems besides any ethanol in there.


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Re: What Gas Octane Rating For Mower ? [Re: ChrisD46] #5400867 04/12/20 07:46 AM
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atikovi Offline
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What does your owners manual say (canned bitog reply)?

Re: What Gas Octane Rating For Mower ? [Re: wag123] #5400874 04/12/20 07:53 AM
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eljefino Offline
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Originally Posted by wag123
Small air cooled lawnmower engines have such a low compression ratio that they will run good on 81 octane gas, if you could buy it.
87 octane gas will work fine. Higher octane than this would be a waste of money, but E0 would be preferable to E10 if it is readily available in your area..


My old briggs flathead recommended 77 octane or better. But my chonda wants 87, per manuals.

I ran my briggs on "white gas" when gas was $4/gallon-- I got the can at a yard sale. It ran fine, exhaust smelled funny, but if I put more gas than I needed in it would evaporate out over the following week!

Re: What Gas Octane Rating For Mower ? [Re: ChrisD46] #5400943 04/12/20 08:41 AM
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Dave9 Offline
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Why would you question this? If it runs fine on the cheaper low octane you already use, then you wasted every moment thinking about it.

Re: What Gas Octane Rating For Mower ? [Re: ChrisD46] #5400960 04/12/20 09:05 AM
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Snagglefoot Offline
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One exception is if you don’t want to use gas with ethanol, some stations have no ethanol in their highest octane gasoline. For instance, Shell in Canada.


If you want the job done right......do it yourself.
Re: What Gas Octane Rating For Mower ? [Re: atikovi] #5400971 04/12/20 09:16 AM
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Originally Posted by atikovi
What does your owners manual say (canned bitog reply)?

That is probably the best advise BITOG has to offer on many of the type of questions.


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