There is a bit of merit in that and it is something I did actually wonder when organising this.
Clearly there are some extra losses using 6mm2 compared to 10mm2 but I think their figures are a little misleading.
They're allowing for 1125 hours use per year which at 7.4kw is 8325kWh per year. If you allow 3 mi/kWh average then that's 25k miles a year which is higher than the average but possible with 2 cars in a house. A lot of households only do 10k a year including us.
Secondly if someone is doing lots of miles in an EV then they'll be on an EV tariff in which case the kWh cost on something like IOG is £0.075.
In our case I think the difference would work out to be less than £1 a year.
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