Prescribed types of fuel - unleaded petrol RON 98/95

Odometer: 2 630km.

Image source: Types of Fuel and Octane Ratings

I just figured out, that in Fabia and Roomster's SUPPLEMENT TO THE OWNER'S MANUAL Technical Changes 11/2010 prescribed fuel is 98!

Grades of petrol
Prescribed types of fuel - unleaded petrol RON 98/95 

Use unleaded petrol 98 RON. You can also use unleaded RON 95. However some loss of power is to be expected when doing so. 

If unleaded RON 98 or RON 95 is not available, you can refuel with unleaded RON 91 in an emergency. After refuelling, continue driving at medium engine speeds and minimum engine load. Driving at high engine speeds or heavy engine loads can lead to serious engine damage! Refuel with petrol with the specified octane number as often as possible. 

Fuel with a lower octane number than RON 91 must not be used even in an emergency.
Otherwise you can cause serious engine damage!

Have no idea what is it related to. Probably it's most for TSI engines and they afraid detonation issues. But who says that in Israel 98 is good enought? I tryed it twice (both from same station, but...) and I feel like 95 is better. Will be glad to find other feedbacks. I'll check that also in Skoda Garage on next visit.