I have found that every single one of my 17 cars went better on premium fuel, if they could be tuned for it (manually or by knock sensor). The two exceptions were my automatic large-displacement Australian cars, which didn't have a function to run more advanced timing and couldn't be driven at high loads consistently. The manual versions of one of those cars did benefit. I'm willing to bet that the manual version of the other would have improved, but I haven't driven one.
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Originally Posted by Crazyrabbit
In God we trust. All others: bring data
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