Man maths and Plug in Hybrids

[P675]

Hi,

At the moment I have a 2006 Lexus GS450H, which as hard as it tries, the battery only lasts about a mile and a half in stop start. I get about 33mpg on my commute and 37mpg on motorway cruise. With fuel prices going up, I'm trying to see how I can minimise this cost. I'm currently paying £260-300 a month on petrol. This is an 18 miles commute through slow country roads (180 a week) and a 90 mile motorway cruise at the weekend, which I am happy to cruise at 70. I'm not desperate to change the car as I do like it, although a big bill may strike one day.

I'm trying to work out if it would be worth it to switch to a plug in hybrid, such as:

2016 Kia Optima
2017 Hyundai Ioniq
2016 BMW 330e
2015 Mercedes C350e

I would have to charge at home on a regular 3 pin. There are no chargers at work but it's rumored there will be some installed (will probably not be enough but, yeah), so lets say I'll only be able to charge at home. These cars, can you put them in electric only mode? If I can't charge at work would it not be worth doing that? Let's say I charge at home every night but drive it in the normal mode, what kind of mpg will I actually get?

I'd have to finance the car if I was paying £250 a month for the car would this offset the fuel bill at all?

[P675]

Hmm ok thanks for all the advice. I should probably wait for prices to come down for it to be worth it. Very surprised at the actual electric range of some of the cars. I was looking into ~2011 Leafs (Leaves?) but read that the battery range can drop to 30 miles!