There’s some sort of tariff calculator on the Octopus website which tells you which tariff would be best. The thing with Octopus Intelligent Go is that it is Intelligent, so it will often give you the cheap rate during the day if your car is plugged in, and all your household electricity is at the cheap rate too. Some others doing a low mileage prefer Octopus Agile which varies every half hour. It’s usually well below the standard day rate all the time and occasionally pays you to charge you car! I don’t agree with Rhodgie that it’s not worth swapping. Some research now will result in a suitable tariff which will drastically cut your running costs
That’s certainly a possibility. I couldn’t find their calculator though.