You can select between three driving modes. Try starting with Aggressive at the start of the race to gain positions. Then, switch to Cautious and remain there as long as possible before making a pit stop.

Aggressive: Fuel and tire consumption rate is very fast. You will get overtakes and slipstreams very often.
Balanced: Fuel and tire consumption rate is normal. You have a regular chance for overtakes and slipstreams.
Cautious: Fuel and tire consumption rate is slower. You will get less overtake chances.