Claim: In the 1985 Belgian Grand Prix there was a 28-second difference between the fastest driver (Brazil's Ayrton Senna on a Lotus-Renault) and second fastest driver (UK's Nigel Mansell on a Williams-Honda) after 43 laps.
Evidence: 43 43 Brazil Ayrton Senna Lotus-Renault United_Kingdom Nigel Mansell Williams-Honda 1:34:19.893 + 28.422