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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: rec tech mower
Date: Sat, 12 Apr 2025 07:51:21 -0500
Organization: Yellow Jersey, Ltd.
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On 4/12/2025 1:41 AM, Jeff Liebermann wrote:
> On Sat, 12 Apr 2025 13:05:24 +0700, John B. <slocombjb@gmail.com>
> wrote:
> 
> (chomp)
>> As an aside, most of the problems with small engines being stored for
>> long periods of time can be caused by the fact that much "Gas Station"
>> gas contains Ethanol. It's worth it to search for "pure gasoline" gas.
>> https://www.buyrealgas.com/states.html
>> https://www.pure-gas.org/
> 
> True.  Here's a video that explains what's happening:
> 
> "The Ugly Truth Why Gas Station Fuel Is Bad For Small Engines"
> <https://www.youtube.com/watch?v=Wvps2gF0Sdo>
> 
> I wasted some time and effort trying to remove the ethanol from retail
> gasoline.  It can be done, but the results are not very good.  The
> problem is that ethanol is an octane booster.  Take away the ethanol
> and the octane rating of the gas goes down.  If I start with regular,
> the octane rating ends up so low that the engine might knock.
> Actually, modern engines change the timing advance so that the engine
> just barely knocks.  It doesn't ping and sorta runs, but not very
> well.
> 
>> I believe that some airfields that cater to old fashioned propeller
>> airplanes may also stock it.
> 
> <https://en.wikipedia.org/wiki/Avgas#93UL_(Ethanol-free_93AKI_automotive_gasoline)>
> Ethanol free gas in a car probably won't hurt the car engine. However,
> there is no authoritative consensus as to whether it's a good or bad
> idea.  Try sampling some articles on the topic:
> <https://www.google.com/search?q=using%20ethanol%20free%20avgas%20in%20car>
> I have little experience and no opinion.
> 

+1
Since none of my autos has computer controls, I pay 
attention to fuels* and for one engine in particular only 
no-ethanol premium.

*My engine guru says most modern autos can digest a range of 
fuels, as the computer adjusts spark timing and injection to 
whatever it is, but small engines don't have those.

-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971