Suzuki Alto fuel consumption

I was told to use Premium unleaded in my Suzuki Alto, but when I rang the dealership for confirmation one person from the service department said that I should use regular unleaded, that using Premium wouldn't make a difference. When I asked for his name he passed me on to someone else who said not to use unleaded. On the fuel cap it says unleaded fuel only, RON 95. What is your advice?

The fuel Suzuki recommends is Premium, or a minimum of 95 octane, which means it's been tuned for that fuel and that's the one you should use to get the best out of it.