You can run 100 in the car. No sweat. Much higher and you won't really see gains. You can acutally see loses if the car isn't tuned for race gas. 100 isn't way higher than pump so it would simply give some added detonation protection and possibly a tad better power. Don't do it just for the power gained however, as it is minimal if any, unless properly tuned for it.
Hope that helps.
All the best,
Jared
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