Hi Racer X, you have to increase the boost level in the corners and decrease it on the straights because in iGP Manager the tires heat up less in the corners and on the straights they heat up more. The boost is a tool in the race that each manager has his own way of using, my recommendation is that you use it only to not lose the DRS, to pass to slower cars that are blocking you and logically in the last lap everything that you have left. Each race you will improve little by little and you will realize how to manage the push level and the boost. Greetings.