Is it cheaper to charge a PHEV or run it on petrol?

Now that we have a £2,500 energy price guarantee will it still be cheaper to charge up my plug-in hybrid electric vehicle (PHEV) or will it be cheaper to buy petrol?

Asked on 13 September 2022 by Malcolm Evans

Answered by Andrew Brady
You'll need to do some calculations to work out which is cheaper. Let's assume that your PHEV is a Mitsubishi Outlander, it can cover 20 miles off a charge and your electricity provider charges 34p per kWh. With its 13.8kWh battery, you'd pay £4.69 to fully charge it - which works out at around 23p per mile. With petrol at 167.22 per litre, assuming a real-world fuel consumption (with a flat battery) of 40mpg, you'd pay around 19p per mile to run it on petrol. Obviously these figures can be substituted based on your own car and electricity tariff, and it's worth bearing in mind that many companies charge less for electricity at off-peak times (such as overnight).
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