Hi my current provider is Octopus on their Go tariff which gives me 5p a unit between 0030hrs and 0430hrs which is normally enough to refill the car during normal day to day use.
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yesterday did a trip from East Grinstead to Teesside via Purley. A total trip of 294 miles. I started with 303 miles and did an average of 63 miles an hour. Got home with 2% battery. amazing figures albeit in summer conditions.
Cheers, all the very best
Vaun