> This is probably not true of modern naturally aspirated cars. There's a whole lot of cars that say "Use premium fuel only" with compression ratios of >10.5:1

> This is probably not true of modern naturally aspirated cars. There's a whole lot of cars that say "Use premium fuel only" with compression ratios of >10.5:1, but rely upon anti-knock sensors to retard timing (and adjust mixture) to avoid detonation with 87 octane fuel.