You can adjust the following in-game deterioration factors and off-track behavior:

・Tire Wear
Adjust the speed at which your tires wear down. The softer your tires, and the more aggressively you use them, the faster they will wear down. This will lead to a reduction in grip.

・Fuel Depletion
Adjust the speed at which your fuel depletes. The longer the accelerator is held down, and the higher your RPM, the more fuel you will end up using.

・Off-Track Grip Reduction
Adjust the loss in tire grip when you drive your car off the track.
Weak: Amount of grip lost is small.
Real: Amount of grip lost is great.