I've had a 2020 RC 300h for just over 2 years now.My mpg doing local short journeys ranges between 38-43 , depending on weather/temperature.
Last April,I drove from Hampshire in Southern England to Donegal/Fermanagh and averaged about 45 mpg,driving right on or around the speed limits all the way.
The car is extremely comfortable,quiet and relaxing to drive...but it's no Porsche but again,no Porsche size bills.It just wafts around with completely adequate performance.Legroom and to a certain extent,headroom, are pretty limited in the rear.
In summary,I've owned much faster cars,better handling cars but none of them approach the RC for both a relaxed drive and ownership experience.If you can stretch to it ,go for a facelift 2020 on F sport with Takumi pack.