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I'm not a fuel expert nor a performance guru so it's good to read stuff like this.The 'ultimate' unleaded which I occasionally put into my turbo and the family people mover has a 98 octane rating and I definitely feel an increase in responsiveness in both cars. This doesn't mean it's necessary for the car, just nice to do occasionally, especially if I'm going on a long road trip.The manufacturer also claims it has 10 times less sulphur emissions than standard unleaded. Does anyone else have a noticable improvement in performance from high octanes?
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