If I were on a deserted road, and there was only 1 gas station within the next hundred miles, and I was nearly out of gas, and they had no 91+, then yeah, I'd get whatever they had.
and then, I would hope that it was cold out, and I would drive the car really softly. the car can retard timing on its own, but only so much.
as soon as possible, I would get the highest octane, and still not drive hard. I would then get an octane booster, then drive normal again.
for example, I have a chip, with a 100oct program, and lets say I love the 100oct feel, but not the 100oct price. so i put in 91, but leave it on the 100oct program, well, if I try to drive the car hard, the car will retard, it will pull timing, be slower, and if I'm lucky, it will be within the threshold of pullability. if not, then it will detonate and detonate badly. I will probably need engine work afterwards. But then again, it was my fault, cause I was an idiot.
so if you are going to be driving in the winter, and you are going to drive the car easily, and short shift at 3K, feel free to run 87, it shouldn't do anything bad to your car (YMMV, literally).
But then again, you bought a Porsche, not a commuter.
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