I switched down from a 2.4 diesel to a phev. I didn't need a big car anymore and the fuel and tax costs were depressing me. I was spending 1100 on road tax and 90-100 a week on diesel I drive to Waterford every weekend and I do a lot of driving around Dublin.
I would have had range anxiety about buying a full Electric because the round trip to a Dunmore is about 340km so I'd never do it on a single charge. So that why I went phev. I've a battery that has a claimed range of 50km and a petrol engine. Basically the car will get me in and out of town on a single charge. I really only use the petrol at the weekend. Like @cluaindiuic once you drive a car like this you become very conscious of driving patterns, speed and economy. My car is phenomenally economical on the petrol up to 110 kph. Over that you can nearly see the needle move on the fuel gauge. It won't go on the electric at that speed. It will click automatically to the petrol.
My tax is now 170 and I spend about 20-25 quid a week on petrol when I go to Wd. I have a charger at home that came with the car like cld and there is a charging point in Dunmore. It's a beautiful car to drive. I bought it on a pcp because I didn't want to take the technology risk.
On the 50km range, I've never achieved this. Things like the number of people you have in the car, what's in the boot, the outside temperature, light, weather, traffic all play havoc with this.