Its impossible to compare one driver with another and subsequently the mpg is difficult to compare between any two drivers, regardless whether its a petrol, hybrid and electric.
The only legitimate way of comparing, is if any two drivers or more drove on the same roads at the same speed in the same weather/temperature.
I only mange 27-32mpg locally, a neighbour with an identica car, who get mid to high 30’s locally. I don’t doubt them as we are two very different drivers.
If I remember @JMC has a long motorway journey that needs to be taken into account, ontop of finding out what the car was capable of.
Don’t get hooked up with someone elses mpg. Its likely to be very different to your own!