With the updated 2021 Volvo S90, the Swedish executive luxury sedan moves into petrol power only, with a 48V mild-hybrid system assisting getaways. It's also our first taste of the new Google-developed infotainment system that bakes Google Assistant and Google Maps right in. Does it all make the Volvo S90 B5 a better luxury car to live with? Our road test review with real-world fuel efficiency and performance figures has the answers.