Octane after almost a year
 

I can`t find the previous thread I started.
A fellow OSO member sent me his octane tester and I tested the different gas combinations .
Here are the results:
Control , taken out of my gas can .. 89 octane

https://cimg1.ibsrv.net/gimg/www.off...8ae93219cf.jpg

Gas out of the Cigarette from last year :

Treated with a octane booster and left open to atmosphere.

https://cimg4.ibsrv.net/gimg/www.off...65a24d8fcf.jpg

Same gas treated with AMSOIL fuel stabilizer , left open to atmospehere.

https://cimg6.ibsrv.net/gimg/www.off...a073a31700.jpg

Same gas treated with marine stabil. Closed bottle
https://cimg8.ibsrv.net/gimg/www.off...55558b0b77.jpg

Same gas non treated closed :

https://cimg3.ibsrv.net/gimg/www.off...eb49afb597.jpg

Fresh Gas from Nor-tech treated with BOOSTANE. Full bottle to 60 gallons.. Im not sure what the numbers mean exactly but seems like 97 octane?


https://cimg8.ibsrv.net/gimg/www.off...f0d1f99b53.jpg

Same fresh gas from Nor-Tech with 50% boostane.. I expected higher octane so not sure whats going on there .

https://cimg0.ibsrv.net/gimg/www.off...6b7fb17010.jpg

What I walked away with :
Using fuel stabilizer will prevent phase seperation but lowers octane.
93 octane treated with boostane and not any fuel stabilizer will not lose octane over a years time.
Boostane seems to be working except the 50/50 test should be higher but it may be too much boostane and the machine can`t read the octane .. I dunno.

Was this summer gasoline?

If so, it is not surprising that octane increases with age, as the higher octane toluene will evaporate less than the lower octane components.

97 RON and 92 pump octane (average of RON and MON).

In the US, the gas station will show pump octane, while in most of the world, it will show RON.

Great info thanks for doing these tests! I didn't know the stabilizer would lower the octane. Running a supercharger myself, this helps.

Toluene has a 114 Ron+Mon/2 Octane.

Dan, thanks for sharing the info. Did I miss if this was non-ethanol?

The only unknown in all of this was what were the octanes to start with? At least the samples that have been setting.