This would be a loaded topic. Did you join just to ask that question?
Hyundai ECU doesn't adjust very widely for octane, unlike many automakers'. Anecdotally, I've noticed more consistent power delivery on midgrade (89) but not additional performance nor should you expect additional performance.
Hyundai ECU doesn't adjust very widely for octane, unlike many automakers'. Anecdotally, I've noticed more consistent power delivery on midgrade (89) but not additional performance nor should you expect additional performance.