I drive a turbocharged European car. Can I fill it up with 92-octane fuel?
This is an important piece of information which you must extract from the owner’s manual.
The minimum octane rating requirement is also usually printed on a sticker on the fuel filler flap. In general, most turbocharged engines, whether European or otherwise, require at least 95-octane fuel.
Using a lower octane rating than is recommended will reduce both performance and efficiency. However, using a higher than minimum octane rating will not have any adverse effect.