Classic episode from Top Gear.
Clarkson sees if an Audi A8 with a V8 diesel engine can run from London to Edinburgh and back on one tank of diesel fuel. He does this to see if Audi's claims about the fuel economy of their large, powerful executive sedan holds up.

Part 1
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   • Top Gear  Audi A8 Fuel Economy Chall...   Part 2


   • Top Gear  Audi A8 Fuel Economy Chall...   Part 3