Refilled with non-ethanol 91 octane ...

[SirDigby]

this was interesting. looks like it died a year ago. Octane rating is the ability for a fuel to resist detonation under pressure. that's it. there are two different methods for testing this; the RON method and the MON method. then the results of the fuel tests are averaged. R+m/2. a modern ignition system will advance the timing to the point of knock or ping then retard slightly. that point depends on the fuel used. THE YARIS manual states use fuel with RON 91 rating.

[ern-diz]

Originally Posted by SirDigby

this was interesting. looks like it died a year ago. Octane rating is the ability for a fuel to resist detonation under pressure. that's it. there are two different methods for testing this; the RON method and the MON method. then the results of the fuel tests are averaged. R+m/2. a modern ignition system will advance the timing to the point of knock or ping then retard slightly. that point depends on the fuel used. THE YARIS manual states use fuel with RON 91 rating.

RON 91 rating is 91 octane?

I've had dudes go at me on here, basically laughing at me for preferring 91 octane. I've since tried some tanks of 87 and can't say I notice a difference in any measure other than my wallet. Still feels like I'm doing the old girl a disservice every time I pump 87, though lol.