How does under-fueling affect performance and risk?

• A. Under-fueling reduces pace due to insufficient fuel for planned laps and can force unplanned stops; risk of running out or pushing beyond optimal performance envelope.
• B. Under-fueling improves acceleration and top speed due to lighter car.
• C. Under-fueling has no effect.
• D. Under-fueling only affects pit stop frequency.

Answer: (A)

Fuel load is a balance between weight and endurance. Carrying less fuel trims weight, which can slightly help acceleration and braking, but you must have enough to cover the planned laps. When you under-fuel, you don’t have enough fuel to complete the stint at the planned pace, so you either pit earlier than intended or risk running dry. That forces a slower overall pace because the early stop adds time and disrupts your strategy. There’s also real danger if you push to compensate for the lighter car: you can run out of fuel or run the engine in a range that increases risk of failure. So under-fueling reduces pace due to insufficient fuel for planned laps and can force unplanned stops, with the added risk of running out or pushing beyond the optimal performance envelope. The other ideas aren’t accurate because the small weight savings don’t meaningfully offset the need to finish the stint and the consequences of an unscheduled stop.