Tesla’s attempts to humble Porsche with a new lap record on Germany's legendary Nürburgring Nordschleife racetrack have reignited a controversy about the value of lap times, as the circuit steps in to quash claims of cheating.

Porsche and US-based Tesla are battling to establish supremacy in lap times for four-door electric sportscars, but comparisons are not exact, as conditions, ranging from car modifications to tyre types, vary with each test...

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