For the record I do always need the second start...but I have never had a stall or near stall after it is started.
Chimera many of us have to run 93 because 91 is very hard to find around here.
Ian you are right, high temperatures will promote knocking.
Knock sensors are usually acoustic, so you will in fact get some knock before power is reduced, but they should be much more sensitive to your ears so it will only be a small amount and you won't even know it. Regardless, it will still be pre-detonating.
This may only happen at full throttle, on a hot day. Most people will be fine. Personally I don't want to bother with the lower octane. My pedal hits the carpet several times a day.
