When fully charged, our Tucson PHEV shows an EV range of 38/39 miles. It never achieves that, as the range drops to around 35 miles when I’ve driven just 1 mile from home. In the summer I get around 32-35 miles and last winter, from memory, it fell to around the mid to high 20s.
What I have noticed is that the last 10 miles goes very quickly – way faster than the mileage shown, and if that’s on a motorway that happens even in the summer. For example, I go somewhere once a week that is 30 miles each way, of which 25 miles is on the motorway. On the outward run I put the car in ‘Automatic’ mode, so I still have around 25 miles EV range when I get there. Staring the return journey with 25 miles I should be able to run in EV mode for all but the last 5 miles, but at motorway speed of mid 70s mph the EV range is fully depleted when I still have 10-12 miles of the journey left.