on their 150-litre fuel limit. Not for the first time, or the last, his public predictions would prove to be wrong. Race summary The McLaren of Ayrton Senna led from the start, whilst his teammate Alain Prost had his engine stall coming to take his place on the grid (Prost later reported that the engine had also stalled earlier on the parade lap). The car was still rolling so he bump started it but it almost stalled again as the race started and he dropped to 7th place behind the Arrows of Eddie Cheever. Whilst he was able to recover these places and get back to second place by lap 8, he could not catch Senna who controlled the gap according to the traffic. Maintaining a lead of 6–10 seconds, Senna slowed on the last lap to make sure he finished without running out of fuel which reduced the gap to the pursuing Prost to just 2.3 seconds at the line. Prost later admitted he had turned up his turbo boost in his fight up to second and although still lapping quicker than most of the field, he was then forced to conserve for the rest of the race for fear of running dry before the end. Nelson Piquet battled with an ill-handling Lotus but used superior Honda power to maintain 3rd place ahead of a train of cars including both Benettons, both Williams and Berger's Ferrari. He was lucky to make it to the finish line as the extra boost needed to keep his position cut severely into his fuel. Had he not been lapped only four laps from the finish (meaning he only had to complete three of the remaining laps), he might not have had enough fuel to complete his last lap. Nigel Mansell made a superb drive from a poor 11th place on the grid to be briefly up to 3rd place after taking Piquet under braking for the Rivazza on lap 40. However, as soon as Mansell got past the Lotus, blue oil smoke started to appear from the back of his Williams and less than a lap later Piquet again used his Honda's superior power to slipstream Mansell through the Tamburello and re-take 3rd through Villeneuve. However fleeting the move was, Mansell would retire just a lap after dropping to 4th with a faulty voltage regulator. Thierry Boutsen's Benetton came home in 4th ahead