Toyota RAV4 Hybrid owners are achieving 50 + mpg, RAV4 PHEV are seeing similar figure, our Suzuki Across ( a rebadge RAV4 PHEV) achieves 50 mpg even in the winter with a depleted battery, our 2020 Outlander PHEV was nearer 32/36 with a depleted battery.
On the motorway we used hybrid mode in cruise control you will be surprised how much energy is generated especial going down hill, on long journey 33% is generated, in stop start or slow A road it is more.
There is a lot of misinformation on the internet, originally I was a sceptic, however in 2020 we took the plunge and went for a 2020 Outlander PHEV we were pleasantly surprised, last year we changed to the Suzuki Across we were very impressed how technology has progressed, we would never go back to a diesel.
Next step is a full EV maybe a Hyundai Ionia 6 with the later 82kWh battery