Quoted:
A Porsche I owned recommended 91 or better octane, but it said in the manual that under emergency conditions, it's OK to use lower octane, but that you shouldn't depress the gas pedal more than halfway. My current BMW says in the manual that you should only use 91 octane or better and that the use of lower octane fuels may result in engine damage or more frequent service intervals (service is controlled by on-board computer).
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My Porsche actually has 2 wires under the floormat you need to connect if you use
low octane fuel in an emergency. When connected, another program takes over in the
ignition computer.
I see a lot of these cars at car shows etc, and I've had a few people complain about the
performance, they were disappointed. I have surprised more than one owner by
showing them those 2 wires were connected, and simply unhooking them. Almost
doubles the performance of the car.