But PHEV's usually have quite a small range
They do but this fits within most peoples mileage most of the time.
I could do all of my local driving on battery power if I'd bought the plug in hybrid version of my car. I could sometimes go weeks without using the petrol engine. But in terms of the actual mileage split, the majority of my mileage is longer journeys often to places where I can't guarantee the availability of easy charging, so petrol suits me much better. A good plug in hybrid though would work well for me.
charge it at work for free
Surely hardly anyone can really do this, why would an employer want to pay for your personal transport at commercial electricity rates?