It's early days using a plug-in hybrid, but after a holiday trip to Cornwall I now have some experience of commercial chargers, though admittedly a small sample. When at home I always charge there - my electricity costs about half the rate per mile of petrol. Looking at commercial chargers, moderate ones (or those at friendly locations) are similar to petrol, while fast chargers can be up to twice the petrol price. For this reason I thought I wouldn’t bother to charge before the return journey, as there wouldn't be a financial advantage, but in reality, travelling the 223 miles down to Gwithian, I found the cleverness of the hybrid mode meant that I got significantly more miles per gallon/kWh than I would on petrol alone. As a result I had four attempts at charging in Cornwall, of which two were successful.  The first one seemed perfect. It was at a location we were staying several hours, at a rate a little cheaper than petrol. I plugged in, started a charge on the app… and not...