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In NASCAR racing, pushing or "bump drafting" is a technique used to gain a slight advantage. Here are some reasons why it's done:

Minimizing Clutch Stress: Pushing the car helps reduce stress on the clutch, making it easier to get the car moving from a standstill.

Preventing Stalling: It helps prevent the car from stalling, especially in pit stops or slow-moving areas.

Reducing Wheelspin: Pushing can help reduce wheelspin when the car is starting to move.

Saving Fuel and Tires: By maintaining higher speeds, pushing can help save fuel and reduce tire wear.

Aerodynamic Benefits: Drafting behind another car reduces air resistance, allowing the following car to move faster and more efficiently.