From reading the manual, it's my understanding that you're supposed to fill the Micra with regular gas. However, my dad has been encouraging me for months to fill up with premium instead because it's better/cleaner for the engine and also helps with fuel economy (you get a tank of gas for longer than with regular). I have noticed that after filling with premium, I do get a bit better mileage.
Is it okay to fill a car with premium even though the manual says regular? My dad has been driving for a long time and I do consider his opinion but I wanted to get some other opinions. He's pretty adamant about only filling the Micra with premium.