Of slightly more concern is that UL91 is only 96 RON.
https://www.warteraviation.com/fuels/avgas-wa-ul-91/
Duncan McF.
> On 29 April 2021 at 02:33 Griffo <scangriffin@bigpond.com.au> wrote:
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> Word of caution to all you aspiring fighter pilots trying for the ultimate
> performance
---From your engine/prop:
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> Auto fuels (95 & 98 RON) are; Not subject to the some quality control
> standards
of AvGas - variation due to adulteration & contamination with other fuels is
common.
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> I use 98 RON most of the time. 95 RON if 98 is not available and on very rare
occasions, when no ULP obtainable, AvGas.
>
> I have always used 98 RON on the assumption (hopefully not false) that if the
fuel had been adulterated, with other fuels (lower grade ULP petrol, Ethanol
blend or diesel) then I am burning at least the equivalent of 95 RON.
>
> So my advise is; Be conservative with the way you set up your engine/prop
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> Read this topic online here:
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> http://forums.matronics.com/viewtopic.php?p=501547#501547
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