I did Wigan to Maasstricht last year, used the tunnel (Folkestone/Calais).
Tanked at Folkestone both ways for convenience, used the company fuel card, so was a very cheap trip fuel wise.
You are correct, it was the reason I wanted an 8
As for Teslas, I find the extension leads are never long enough
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Ray at Wigan Pier
2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore..
In progress, Nothing left to do.
Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter)