Advice on plug in hybrid

Hello V 60 driver ( maybe also XC 60 ) I love to buy a used V60 Bj from about 2020. my driving profile is mostly ( 90% ) highway , for short distances I take summer like winter the bike or the BEV of my wife. I mostly drive 600 km at a time – that is about 40 times a year. That means the approx. 50 km electric fall into the bill with the fuel pure but actually interest me the difference between the diesel and the petrol. Fuel monitor is nu r very partially helpful because you will find out more about the entire consumption but how often is recharged and what the cars do not consume by burning. Would be grateful if I hear your experiences and opinions. Alas, my driving mode is gentle, speed usually between 120 and 130, very rarely times 140 or more, if restrictions I go off the gas in time to avoid unnecessary braking. Are consumptions around the 6 liters realistic? also with the petrol engine?? much more should This is because it is not going to happen.