u/Rich-Wish1162

Hello we purchased a 2025 Kia Niro PHEV 2 months ago and have only used 1/4 tank of gas since my commute is short. Do I need to do something about all this fuel I haven’t used as I’m sure I won’t use the whole tank the dealership filled up for us 2 months ago. My husband was saying he will put fuel stabilizer in it but I’m worried that will wreck something. I’m sure the dealership only put in regular gas. Also I have no clue when to get my first oil change. Bought the car June 13th and they’ve scheduled it for December but my son says to do it under 2000kms for the first one, what do you think?
EDIT thanks everyone. I will drive with the fuel to burn it off and put premium in next time and use fuel stabilizer if it sits too long